File audio-add-sanity-check.patch of Package qemu.30222

From: Gerd Hoffmann <kraxel@redhat.com>
Date: Tue, 15 Dec 2020 09:11:51 +0100
Subject: audio: add sanity check

Git-commit: 06c8c375389a54d8e4457d967f4f0896caecefb2
References: boo#1180210

Check whenever we actually found the spiceaudio driver
before flipping the can_be_default field.

Fixes: f0c4555edfdd ("audio: remove qemu_spice_audio_init()")
Buglink: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=977301
Reported-by: dann frazier <dann.frazier@canonical.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-Id: <20201215081151.20095-1-kraxel@redhat.com>
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 audio/audio.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/audio/audio.c b/audio/audio.c
index 46578e4a583b9ad5c5fd4d40c711..973804620d7b057b70833694947c 100644
--- a/audio/audio.c
+++ b/audio/audio.c
@@ -1709,7 +1709,9 @@ static AudioState *audio_init(Audiodev *dev, const char *name)
          * backend and this can go away.
          */
         driver = audio_driver_lookup("spice");
-        driver->can_be_default = 1;
+        if (driver) {
+            driver->can_be_default = 1;
+        }
     }
 
     if (dev) {