sh: Make sure indexes are positive

The indexes are signed, make sure they are not negative
when we read array elements.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/sh/boards/mach-highlander/setup.c b/arch/sh/boards/mach-highlander/setup.c
index 566e69d8d729..f663c14d8885 100644
--- a/arch/sh/boards/mach-highlander/setup.c
+++ b/arch/sh/boards/mach-highlander/setup.c
@@ -384,7 +384,7 @@ static unsigned char irl2irq[HL_NR_IRL];
 
 static int highlander_irq_demux(int irq)
 {
-        if (irq >= HL_NR_IRL || !irl2irq[irq])
+        if (irq >= HL_NR_IRL || irq < 0 || !irl2irq[irq])
                 return irq;
 
         return irl2irq[irq];