[PATCH] [MIPS] vr41xx: unsigned irq cannot be negative

[roel kluin <roel.kluin@gmail.com>]

unsigned irq cannot be negative

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
---
diff --git a/arch/mips/vr41xx/common/irq.c b/arch/mips/vr41xx/common/irq.c
index cba36a2..92dd1a0 100644
--- a/arch/mips/vr41xx/common/irq.c
+++ b/arch/mips/vr41xx/common/irq.c
@@ -72,6 +72,7 @@ static void irq_dispatch(unsigned int irq)
        cascade = irq_cascade + irq;
        if (cascade->get_irq != NULL) {
                unsigned int source_irq = irq;
+               int ret;
                desc = irq_desc + source_irq;
                if (desc->chip->mask_ack)
                        desc->chip->mask_ack(source_irq);
@@ -79,8 +80,9 @@ static void irq_dispatch(unsigned int irq)
                        desc->chip->mask(source_irq);
                        desc->chip->ack(source_irq);
                }
-               irq = cascade->get_irq(irq);
-               if (irq < 0)
+               ret = cascade->get_irq(irq);
+               irq = ret;
+               if (ret < 0)
                        atomic_inc(&irq_err_count);
                else
                        irq_dispatch(irq);