[MIPS] Add missing returns in signal code.

Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/kernel/signal.c

@@ -443,6 +443,8 @@ void do_signal(struct pt_regs *regs)
 			if (test_thread_flag(TIF_RESTORE_SIGMASK))
 				clear_thread_flag(TIF_RESTORE_SIGMASK);
 		}
+
+		return;
 	}
 
 	/*

arch/mips/kernel/signal32.c

@@ -833,6 +833,8 @@ void do_signal32(struct pt_regs *regs)
 			if (test_thread_flag(TIF_RESTORE_SIGMASK))
 				clear_thread_flag(TIF_RESTORE_SIGMASK);
 		}
+
+		return;
 	}
 
 	/*