I used the clang-tidy qemu-round check to generate the fix:
https://github.com/elmarco/clang-tools-extra

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Richard Henderson <rth@twiddle.net>
---
 hw/audio/pcspk.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/audio/pcspk.c b/hw/audio/pcspk.c
index f643b122bb..0206f7399b 100644
--- a/hw/audio/pcspk.c
+++ b/hw/audio/pcspk.c
@@ -69,7 +69,7 @@ static inline void generate_samples(PCSpkState *s)
         const uint32_t n = ((uint64_t)PIT_FREQ << 32) / m;
 
         /* multiple of wavelength for gapless looping */
-        s->samples = (PCSPK_BUF_LEN * PIT_FREQ / m * m / (PIT_FREQ >> 1) + 1) >> 1;
+        s->samples = (QEMU_ALIGN_DOWN(PCSPK_BUF_LEN * PIT_FREQ, m) / (PIT_FREQ >> 1) + 1) >> 1;
         for (i = 0; i < s->samples; ++i)
             s->sample_buf[i] = (64 & (n * i >> 25)) - 32;
     } else {
-- 
2.14.1.146.gd35faa819