totemsrp: remove unnecessary cast to avoid "make syntax-check" failure

* exec/totemsrp.c (message_handler_memb_join): Remove unnecessary
cast of alloca return value.

git-svn-id: http://svn.fedorahosted.org/svn/corosync/trunk@2279 fd59a12c-fef9-0310-b244-a6a79926bd2f

exec/totemsrp.c

@@ -4025,7 +4025,7 @@ static int message_handler_memb_join (
 	int endian_conversion_needed)
 {
 	const struct memb_join *memb_join;
-	struct memb_join *memb_join_convert = (struct memb_join *)alloca (msg_len);
+	struct memb_join *memb_join_convert = alloca (msg_len);
 	int gather_entered;
 
 	if (endian_conversion_needed) {