LSM: do not initialize common_audit_data to 0

It isn't needed.  If you don't set the type of the data associated with
that type it is a pretty obvious programming bug.  So why waste the cycles?

Signed-off-by: Eric Paris <eparis@redhat.com>
diff --git a/security/smack/smack.h b/security/smack/smack.h
index 4ede719..b61e75f 100644
--- a/security/smack/smack.h
+++ b/security/smack/smack.h
@@ -319,7 +319,7 @@
 static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
 			       char type)
 {
-	memset(a, 0, sizeof(*a));
+	memset(&a->sad, 0, sizeof(a->sad));
 	a->a.type = type;
 	a->a.smack_audit_data = &a->sad;
 	a->a.smack_audit_data->function = func;