In preparation of raising -Wimplicit-fallthrough to 5, replace all
fall-through comments with the fallthrough attribute pseudo-keyword.

Signed-off-by: Emmanouil Pitsidianakis <manos.pitsidianakis@linaro.org>
---
 audio/audio.c     | 16 ++++++++--------
 audio/jackaudio.c |  4 ++--
 audio/pwaudio.c   |  4 ++--
 3 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/audio/audio.c b/audio/audio.c
index e9815d6812..ed7c795af7 100644
--- a/audio/audio.c
+++ b/audio/audio.c
@@ -245,39 +245,39 @@ static int audio_validate_settings (struct audsettings *as)
 static int audio_pcm_info_eq (struct audio_pcm_info *info, struct audsettings *as)
 {
     int bits = 8;
     bool is_signed = false, is_float = false;
 
     switch (as->fmt) {
     case AUDIO_FORMAT_S8:
         is_signed = true;
-        /* fall through */
+        fallthrough;
     case AUDIO_FORMAT_U8:
         break;
 
     case AUDIO_FORMAT_S16:
         is_signed = true;
-        /* fall through */
+        fallthrough;
     case AUDIO_FORMAT_U16:
         bits = 16;
         break;
 
     case AUDIO_FORMAT_F32:
         is_float = true;
-        /* fall through */
+        fallthrough;
     case AUDIO_FORMAT_S32:
         is_signed = true;
-        /* fall through */
+        fallthrough;
     case AUDIO_FORMAT_U32:
         bits = 32;
         break;
 
     default:
         abort();
     }
     return info->freq == as->freq
         && info->nchannels == as->nchannels
         && info->is_signed == is_signed
         && info->is_float == is_float
         && info->bits == bits
         && info->swap_endianness == (as->endianness != AUDIO_HOST_ENDIANNESS);
 }
@@ -285,45 +285,45 @@ static int audio_pcm_info_eq (struct audio_pcm_info *info, struct audsettings *a
 void audio_pcm_init_info (struct audio_pcm_info *info, struct audsettings *as)
 {
     int bits = 8, mul;
     bool is_signed = false, is_float = false;
 
     switch (as->fmt) {
     case AUDIO_FORMAT_S8:
         is_signed = true;
-        /* fall through */
+        fallthrough;
     case AUDIO_FORMAT_U8:
         mul = 1;
         break;
 
     case AUDIO_FORMAT_S16:
         is_signed = true;
-        /* fall through */
+        fallthrough;
     case AUDIO_FORMAT_U16:
         bits = 16;
         mul = 2;
         break;
 
     case AUDIO_FORMAT_F32:
         is_float = true;
-        /* fall through */
+        fallthrough;
     case AUDIO_FORMAT_S32:
         is_signed = true;
-        /* fall through */
+        fallthrough;
     case AUDIO_FORMAT_U32:
         bits = 32;
         mul = 4;
         break;
 
     default:
         abort();
     }
 
     info->freq = as->freq;
     info->bits = bits;
     info->is_signed = is_signed;
     info->is_float = is_float;
     info->nchannels = as->nchannels;
     info->bytes_per_frame = as->nchannels * mul;
     info->bytes_per_second = info->freq * info->bytes_per_frame;
     info->swap_endianness = (as->endianness != AUDIO_HOST_ENDIANNESS);
 }
diff --git a/audio/jackaudio.c b/audio/jackaudio.c
index 974a3caad3..fc602411cd 100644
--- a/audio/jackaudio.c
+++ b/audio/jackaudio.c
@@ -574,22 +574,22 @@ static int qjack_init_in(HWVoiceIn *hw, struct audsettings *as,
 static void qjack_client_fini_locked(QJackClient *c)
 {
     switch (c->state) {
     case QJACK_STATE_RUNNING:
         jack_deactivate(c->client);
-        /* fallthrough */
+        fallthrough;
 
     case QJACK_STATE_SHUTDOWN:
         jack_client_close(c->client);
         c->client = NULL;
 
         qjack_buffer_free(&c->fifo);
         g_free(c->port);
         g_free(c->process_buffers);
 
         c->state = QJACK_STATE_DISCONNECTED;
-        /* fallthrough */
+        fallthrough;
 
     case QJACK_STATE_DISCONNECTED:
         break;
     }
 }
diff --git a/audio/pwaudio.c b/audio/pwaudio.c
index bf26fadb06..89b31617a6 100644
--- a/audio/pwaudio.c
+++ b/audio/pwaudio.c
@@ -487,31 +487,31 @@ static void
 qpw_set_position(uint32_t channels, uint32_t position[SPA_AUDIO_MAX_CHANNELS])
 {
     memcpy(position, (uint32_t[SPA_AUDIO_MAX_CHANNELS]) { SPA_AUDIO_CHANNEL_UNKNOWN, },
            sizeof(uint32_t) * SPA_AUDIO_MAX_CHANNELS);
     /*
      * TODO: This currently expects the only frontend supporting more than 2
      * channels is the usb-audio.  We will need some means to set channel
      * order when a new frontend gains multi-channel support.
      */
     switch (channels) {
     case 8:
         position[6] = SPA_AUDIO_CHANNEL_SL;
         position[7] = SPA_AUDIO_CHANNEL_SR;
-        /* fallthrough */
+        fallthrough;
     case 6:
         position[2] = SPA_AUDIO_CHANNEL_FC;
         position[3] = SPA_AUDIO_CHANNEL_LFE;
         position[4] = SPA_AUDIO_CHANNEL_RL;
         position[5] = SPA_AUDIO_CHANNEL_RR;
-        /* fallthrough */
+        fallthrough;
     case 2:
         position[0] = SPA_AUDIO_CHANNEL_FL;
         position[1] = SPA_AUDIO_CHANNEL_FR;
         break;
     case 1:
         position[0] = SPA_AUDIO_CHANNEL_MONO;
         break;
     default:
         dolog("Internal error: unsupported channel count %d\n", channels);
     }
 }
-- 
2.39.2