[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/core/sound.c b/sound/core/sound.c
index 02c8cc4..cd86272 100644
--- a/sound/core/sound.c
+++ b/sound/core/sound.c
@@ -332,7 +332,7 @@
  *  INFO PART
  */
 
-static struct snd_info_entry *snd_minor_info_entry = NULL;
+static struct snd_info_entry *snd_minor_info_entry;
 
 static const char *snd_device_type_name(int type)
 {