[MIPS] ip27-timer: fix unsigned irq < 0

Signed-off-by: Roel Kluin <12o3l@tiscali.nl>
Acked-By: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/sgi-ip27/ip27-timer.c b/arch/mips/sgi-ip27/ip27-timer.c
index 25d3baf..9cebc9e 100644
--- a/arch/mips/sgi-ip27/ip27-timer.c
+++ b/arch/mips/sgi-ip27/ip27-timer.c
@@ -158,7 +158,7 @@
 	}
 }
 
-unsigned int rt_timer_irq;
+int rt_timer_irq;
 
 static irqreturn_t hub_rt_counter_handler(int irq, void *dev_id)
 {
@@ -219,7 +219,7 @@
 
 static void __init hub_rt_clock_event_global_init(void)
 {
-	unsigned int irq;
+	int irq;
 
 	do {
 		smp_wmb();