netfilter: ipset: add a coding-style fix to ip_set_ext_destroy.

Use a local variable to hold comment in order to align the arguments of
ip_set_comment_free properly.
Signed-off-by: Jeremy Sowden <jeremy@azazel.net>
Acked-by: Jozsef Kadlecsik <kadlec@netfilter.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

include/linux/netfilter/ipset/ip_set.h

@@ -269,9 +269,11 @@ ip_set_ext_destroy(struct ip_set *set, void *data)
 	/* Check that the extension is enabled for the set and
 	 * call it's destroy function for its extension part in data.
 	 */
-	if (SET_WITH_COMMENT(set))
-		ip_set_extensions[IPSET_EXT_ID_COMMENT].destroy(
-			set, ext_comment(data, set));
+	if (SET_WITH_COMMENT(set)) {
+		struct ip_set_comment *c = ext_comment(data, set);
+
+		ip_set_extensions[IPSET_EXT_ID_COMMENT].destroy(set, c);
+	}
 }
 
 static inline int