ller <davem@davemloft.net> 1279250877 -0700

drivers: irda: fix sign bug

platform_get_irq_byname() can return negative results, it is not seen to
unsigned irq. Make it signed.

Signed-off-by: Kulikov Vasiliy <segooon@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>