Merge commit '51f76e4e932ebdce8ccf6cf0797651d632cfc3e2' into release/2.4

* commit '51f76e4e932ebdce8ccf6cf0797651d632cfc3e2':
  oss_audio: use a macro to simplify ioctl() error checking

Conflicts:
	libavdevice/oss_audio.c

See: 69c7aad494
Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavdevice/oss_audio.c

@@ -49,6 +49,7 @@ int ff_oss_audio_open(AVFormatContext *s1, int is_output,
     int audio_fd;
     int tmp, err;
     char *flip = getenv("AUDIO_FLIP_LEFT");
+    char errbuff[128];
 
     if (is_output)
         audio_fd = avpriv_open(audio_device, O_WRONLY);
@@ -74,14 +75,15 @@ int ff_oss_audio_open(AVFormatContext *s1, int is_output,
 
 #define CHECK_IOCTL_ERROR(event)                                              \
     if (err < 0) {                                                            \
-        av_log(s1, AV_LOG_ERROR, #event ": %s\n", strerror(errno));         \
+        av_strerror(AVERROR(errno), errbuff, sizeof(errbuff));                \
+        av_log(s1, AV_LOG_ERROR, #event ": %s\n", errbuff);                   \
         goto fail;                                                            \
     }
 
     /* select format : favour native format
      * We don't CHECK_IOCTL_ERROR here because even if failed OSS still may be
      * usable. If OSS is not usable the SNDCTL_DSP_SETFMTS later is going to
-     * fail anyway. `err =` kept to eliminate compiler warning. */
+     * fail anyway. */
     err = ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &tmp);
     if (err < 0) {
         av_log(s1, AV_LOG_WARNING, "SNDCTL_DSP_GETFMTS: %s\n", strerror(errno));