[MIPS] die(): Properly declare as non-returning

 This marks the declaration of die() correctly, removing "control reaches
end of non-void function" warnings from non-void functions that die() at
the end.
Signed-off-by: NMaciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

include/asm-mips/ptrace.h

@@ -86,7 +86,7 @@ struct pt_regs {
 
 extern asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit);
 
-extern NORET_TYPE void die(const char *, struct pt_regs *);
+extern NORET_TYPE void die(const char *, struct pt_regs *) ATTRIB_NORET;
 
 static inline void die_if_kernel(const char *str, struct pt_regs *regs)
 {