[MIPS] Make do_signal return void.
    
It's return value is ignored everywhere.
    
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

---
diff --git a/include/asm-mips/abi.h b/include/asm-mips/abi.h
index 5edd69b..1ce0518 100644
--- a/include/asm-mips/abi.h
+++ b/include/asm-mips/abi.h
@@ -13,7 +13,7 @@
 #include <asm/siginfo.h>
 
 struct mips_abi {
-	int (* const do_signal)(struct pt_regs *regs);
+	void (* const do_signal)(struct pt_regs *regs);
 	int (* const setup_frame)(struct k_sigaction * ka,
 	                          struct pt_regs *regs, int signr,
 	                          sigset_t *set);