LoongArch: Return earlier in die() if notify_die() returns NOTIFY_STOP

After the call to oops_exit(), it should not panic or execute
the crash kernel if the oops is to be suppressed.
Suggested-by: Maciej W. Rozycki <macro@orcam.me.uk>
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

arch/loongarch/kernel/traps.c

@@ -404,6 +404,9 @@ void die(const char *str, struct pt_regs *regs)
 
 	oops_exit();
 
+	if (ret == NOTIFY_STOP)
+		return;
+
 	if (regs && kexec_should_crash(current))
 		crash_kexec(regs);
 
@@ -413,7 +416,6 @@ void die(const char *str, struct pt_regs *regs)
 	if (panic_on_oops)
 		panic("Fatal exception");
 
-	if (ret != NOTIFY_STOP)
 	make_task_dead(SIGSEGV);
 }