Rename _sndrv_pcm_format to _snd_pcm_format

Rename _sndrv_pcm_format to _snd_pcm_format for compatible with alsa-lib.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/src/asound.h b/src/asound.h
index 29abfee..f43c300 100644
--- a/src/asound.h
+++ b/src/asound.h
@@ -133,7 +133,7 @@
 	SND_PCM_ACCESS_LAST = SND_PCM_ACCESS_RW_NONINTERLEAVED,
 } snd_pcm_access_t;
 
-typedef enum _sndrv_pcm_format {
+typedef enum _snd_pcm_format {
 	SND_PCM_FORMAT_UNKNOWN = -1,
 	SND_PCM_FORMAT_S8 = 0,	/* signed */
 	SND_PCM_FORMAT_U8,	/* unsigned */