If we want to add some info to errp (by error_prepend() or
error_append_hint()), we must use the ERRP_AUTO_PROPAGATE macro.
Otherwise, this info will not be added when errp == &fatal_err
(the program will exit prior to the error_append_hint() or
error_prepend() call).  Fix such cases.

If we want to check error after errp-function call, we need to
introduce local_err and than propagate it to errp. Instead, use
ERRP_AUTO_PROPAGATE macro, benefits are:
1. No need of explicit error_propagate call
2. No need of explicit local_err variable: use errp directly
3. ERRP_AUTO_PROPAGATE leaves errp as is if it's not NULL or
   &error_fatel, this means that we don't break error_abort
   (we'll abort on error_set, not on error_propagate)

This commit (together with its neighbors) was generated by

for f in $(git grep -l errp \*.[ch]); do \
    spatch --sp-file scripts/coccinelle/auto-propagated-errp.cocci \
    --macro-file scripts/cocci-macro-file.h --in-place --no-show-diff $f; \
done;

then fix a bit of compilation problems: coccinelle for some reason
leaves several
f() {
    ...
    goto out;
    ...
    out:
}
patterns, with "out:" at function end.

then
./python/commit-per-subsystem.py MAINTAINERS "$(< auto-msg)"

(auto-msg was a file with this commit message)

Still, for backporting it may be more comfortable to use only the first
command and then do one huge commit.

Reported-by: Kevin Wolf <kwolf@redhat.com>
Reported-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
 audio/audio.c        | 12 +++++-------
 hw/audio/intel-hda.c | 13 ++++++-------
 2 files changed, 11 insertions(+), 14 deletions(-)

diff --git a/audio/audio.c b/audio/audio.c
index 7128ee98dc..774f47d418 100644
--- a/audio/audio.c
+++ b/audio/audio.c
@@ -1936,19 +1936,17 @@ static void audio_validate_per_direction_opts(
 
 static void audio_validate_opts(Audiodev *dev, Error **errp)
 {
-    Error *err = NULL;
+    ERRP_AUTO_PROPAGATE();
 
     audio_create_pdos(dev);
 
-    audio_validate_per_direction_opts(audio_get_pdo_in(dev), &err);
-    if (err) {
-        error_propagate(errp, err);
+    audio_validate_per_direction_opts(audio_get_pdo_in(dev), errp);
+    if (*errp) {
         return;
     }
 
-    audio_validate_per_direction_opts(audio_get_pdo_out(dev), &err);
-    if (err) {
-        error_propagate(errp, err);
+    audio_validate_per_direction_opts(audio_get_pdo_out(dev), errp);
+    if (*errp) {
         return;
     }
 
diff --git a/hw/audio/intel-hda.c b/hw/audio/intel-hda.c
index 6ecd383540..d0b178a1e1 100644
--- a/hw/audio/intel-hda.c
+++ b/hw/audio/intel-hda.c
@@ -1095,9 +1095,9 @@ static void intel_hda_reset(DeviceState *dev)
 
 static void intel_hda_realize(PCIDevice *pci, Error **errp)
 {
+    ERRP_AUTO_PROPAGATE();
     IntelHDAState *d = INTEL_HDA(pci);
     uint8_t *conf = d->pci.config;
-    Error *err = NULL;
     int ret;
 
     d->name = object_get_typename(OBJECT(d));
@@ -1109,20 +1109,19 @@ static void intel_hda_realize(PCIDevice *pci, Error **errp)
 
     if (d->msi != ON_OFF_AUTO_OFF) {
         ret = msi_init(&d->pci, d->old_msi_addr ? 0x50 : 0x60,
-                       1, true, false, &err);
+                       1, true, false, errp);
         /* Any error other than -ENOTSUP(board's MSI support is broken)
          * is a programming error */
         assert(!ret || ret == -ENOTSUP);
         if (ret && d->msi == ON_OFF_AUTO_ON) {
             /* Can't satisfy user's explicit msi=on request, fail */
-            error_append_hint(&err, "You have to use msi=auto (default) or "
-                    "msi=off with this machine type.\n");
-            error_propagate(errp, err);
+            error_append_hint(errp, "You have to use msi=auto (default) or "
+                              "msi=off with this machine type.\n");
             return;
         }
-        assert(!err || d->msi == ON_OFF_AUTO_AUTO);
+        assert(!*errp || d->msi == ON_OFF_AUTO_AUTO);
         /* With msi=auto, we fall back to MSI off silently */
-        error_free(err);
+        error_free_errp(errp);
     }
 
     memory_region_init_io(&d->mmio, OBJECT(d), &intel_hda_mmio_ops, d,
-- 
2.21.0