[ALSA] echoaudio - convert from semaphore to mutex

Converted from semaphore to mutex.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
diff --git a/sound/pci/echoaudio/echoaudio.h b/sound/pci/echoaudio/echoaudio.h
index 7e88c96..1c88e05 100644
--- a/sound/pci/echoaudio/echoaudio.h
+++ b/sound/pci/echoaudio/echoaudio.h
@@ -361,7 +361,7 @@
 	spinlock_t lock;
 	struct snd_pcm_substream *substream[DSP_MAXPIPES];
 	int last_period[DSP_MAXPIPES];
-	struct semaphore mode_mutex;
+	struct mutex mode_mutex;
 	u16 num_digital_modes, digital_mode_list[6];
 	u16 num_clock_sources, clock_source_list[10];
 	atomic_t opencount;