____call_usermodehelper: don't flush_signals()

____call_usermodehelper() has no reason for flush_signals().  It is a fresh
forked process which is going to exec a user-space application or exit on
failure.
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/kmod.c

@@ -135,7 +135,6 @@ static int ____call_usermodehelper(void *data)
 
 	/* Unblock all signals and set the session keyring. */
 	new_session = key_get(sub_info->ring);
-	flush_signals(current);
 	spin_lock_irq(&current->sighand->siglock);
 	old_session = __install_session_keyring(current, new_session);
 	flush_signal_handlers(current, 1);