xtensa: can't get to do_notify_resume() when user_mode(regs) is not true

asm glue checks that

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

arch/xtensa/kernel/signal.c

@@ -527,9 +527,6 @@ static void do_signal(struct pt_regs *regs)
 
 void do_notify_resume(struct pt_regs *regs)
 {
-	if (!user_mode(regs))
-		return;
-
 	if (test_thread_flag(TIF_SIGPENDING))
 		do_signal(regs);