Mark __die() "noreturn" for real.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/include/asm-mips/system.h b/include/asm-mips/system.h
index ec29c93..b9c24bb 100644
--- a/include/asm-mips/system.h
+++ b/include/asm-mips/system.h
@@ -431,7 +431,7 @@
 extern void per_cpu_trap_init(void);
 
 extern NORET_TYPE void __die(const char *, struct pt_regs *, const char *file,
-	const char *func, unsigned long line);
+	const char *func, unsigned long line) ATTRIB_NORET;
 extern void __die_if_kernel(const char *, struct pt_regs *, const char *file,
 	const char *func, unsigned long line);