[PATCH] Fix IRDA irq handler prototype

This fixes a mismatch in declaration between "irport_interrupt" in the
header files (returning void) and in the definition (returning
irqreturn_t).

include/net/irda/irport.h

@@ -81,7 +81,7 @@ int  irport_close(struct irport_cb *self);
 void irport_start(struct irport_cb *self);
 void irport_stop(struct irport_cb *self);
 void irport_change_speed(void *priv, __u32 speed);
-void irport_interrupt(int irq, void *dev_id, struct pt_regs *regs);
+irqreturn_t irport_interrupt(int irq, void *dev_id, struct pt_regs *regs);
 int  irport_hard_xmit(struct sk_buff *skb, struct net_device *dev);
 int  irport_net_open(struct net_device *dev);
 int  irport_net_close(struct net_device *dev);