Know about SND_PCM_STATE_RUNNING, might fix some bugs

git-svn-id: https://svn.musicpd.org/mpd/trunk@7077 09075e82-0dd4-0310-85a5-a0d7c8717e4f

src/audioOutputs/audioOutput_alsa.c

@@ -350,6 +350,10 @@ static int alsa_errorRecovery(AlsaData * ad, int err)
 		snd_pcm_close(ad->pcmHandle);
 		ad->pcmHandle = NULL;
 		break;
+        /* this is no error, so just keep running */
+    case SND_PCM_STATE_RUNNING:
+        err = 0;
+        break;
 	default:
 		/* unknown state, do nothing */
 		break;