kernel/audit.c: use ARRAY_SIZE instead of sizeof/sizeof[0]

Use kernel.h definition.

Cc: Eric Paris <eparis@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Richard Guy Briggs <rgb@redhat.com>

kernel/audit.c

@@ -750,7 +750,7 @@ static int audit_set_feature(struct sk_buff *skb)
 	struct audit_features *uaf;
 	int i;
 
-	BUILD_BUG_ON(AUDIT_LAST_FEATURE + 1 > sizeof(audit_feature_names)/sizeof(audit_feature_names[0]));
+	BUILD_BUG_ON(AUDIT_LAST_FEATURE + 1 > ARRAY_SIZE(audit_feature_names));
 	uaf = nlmsg_data(nlmsg_hdr(skb));
 
 	/* if there is ever a version 2 we should handle that here */