[MIPS] Fix minor sparse warnings

Signed-off-by: NAtsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/kernel/signal.c

@@ -340,7 +340,7 @@ int setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
 
 	/* Create the ucontext.  */
 	err |= __put_user(0, &frame->rs_uc.uc_flags);
-	err |= __put_user(0, &frame->rs_uc.uc_link);
+	err |= __put_user(NULL, &frame->rs_uc.uc_link);
 	err |= __put_user((void *)current->sas_ss_sp,
 	                  &frame->rs_uc.uc_stack.ss_sp);
 	err |= __put_user(sas_ss_flags(regs->regs[29]),

arch/mips/kernel/signal32.c

@@ -456,7 +456,7 @@ int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
 			err |= __put_user(from->si_uid, &to->si_uid);
 			break;
 		case __SI_FAULT >> 16:
-			err |= __put_user((long)from->si_addr, &to->si_addr);
+			err |= __put_user((unsigned long)from->si_addr, &to->si_addr);
 			break;
 		case __SI_POLL >> 16:
 			err |= __put_user(from->si_band, &to->si_band);

arch/mips/kernel/signal_n32.c

@@ -48,6 +48,8 @@
 #define __NR_N32_rt_sigreturn		6211
 #define __NR_N32_restart_syscall	6214
 
+#define DEBUG_SIG 0
+
 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
 
 /* IRIX compatible stack_t  */