[ALSA] wavefront - Fix a compile warning

Modules: Wavefront drivers

Fix a gcc-4.1 compile warning regarding uninitialized variables.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

sound/isa/wavefront/wavefront_synth.c

@@ -866,7 +866,7 @@ wavefront_send_sample (snd_wavefront_t *dev,
 	   divided by 2.
         */
 
-	u16 sample_short;
+	u16 sample_short = 0;
 	u32 length;
 	u16 __user *data_end = NULL;
 	unsigned int i;