[PATCH] little do_group_exit() cleanup

zap_other_threads() sets SIGNAL_GROUP_EXIT at the very start,
do_group_exit() doesn't need to do it.
Signed-off-by: NOleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

kernel/exit.c

@@ -925,7 +925,6 @@ do_group_exit(int exit_code)
 			/* Another thread got here before we took the lock.  */
 			exit_code = sig->group_exit_code;
 		else {
-			sig->flags = SIGNAL_GROUP_EXIT;
 			sig->group_exit_code = exit_code;
 			zap_other_threads(current);
 		}