nios2: fix unhandled signals

Follow other architectures for user fault handling.

Signed-off-by: Chung-Ling Tang <[e-mail]>
Acked-by: Ley Foon Tan <[e-mail]>

arch/nios2/mm/fault.c

···
 bad_area_nosemaphore:
 	/* User mode accesses just cause a SIGSEGV */
 	if (user_mode(regs)) {
-		pr_alert("%s: unhandled page fault (%d) at 0x%08lx, "
-			"cause %ld\n", current->comm, SIGSEGV, address, cause);
-		show_regs(regs);
+		if (unhandled_signal(current, SIGSEGV) && printk_ratelimit()) {
+			pr_info("%s: unhandled page fault (%d) at 0x%08lx, "
+				"cause %ld\n", current->comm, SIGSEGV, address, cause);
+			show_regs(regs);
+		}
 		_exception(SIGSEGV, regs, code, address);
 		return;
 	}