[ALSA] Remove zero-initialization of static variables

Removed zero-initializations of static variables.
A tiny optimization.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/ali5451/ali5451.c b/sound/pci/ali5451/ali5451.c
index 4f01ef1..5dfdbf6 100644
--- a/sound/pci/ali5451/ali5451.c
+++ b/sound/pci/ali5451/ali5451.c
@@ -49,7 +49,7 @@
 static int index = SNDRV_DEFAULT_IDX1;	/* Index */
 static char *id = SNDRV_DEFAULT_STR1;	/* ID for this card */
 static int pcm_channels = 32;
-static int spdif = 0;
+static int spdif;
 
 module_param(index, int, 0444);
 MODULE_PARM_DESC(index, "Index value for ALI M5451 PCI Audio.");