net: enic: include irq.h for irqreturn_t definitions

The enic driver fails to build on ARM with:

In file included from drivers/net/ethernet/cisco/enic/enic_res.c:40:0:
drivers/net/ethernet/cisco/enic/enic.h:48:2: error: expected specifier-qualifier-list before 'irqreturn_t'
irqreturn_t (*isr)(int, void *);
^

Nothing in the driver is explicitly including the irq definitions, so we add an include of linux/irq.h to pick them up.

---
 drivers/net/ethernet/cisco/enic/enic.h | 1 +
 1 file changed, 1 insertion(+)

index e9f7c656ddda..e35c8e0202ad 100644
@@ -29,6 +29,7 @@
 #include "vnic_stats.h"
 #include "vnic_nic.h"
 #include "vnic_rss.h"
+#include <linux/irq.h>
 
 #define DRV_NAME		"enic"
 #define DRV_DESCRIPTION		"Cisco VIC Ethernet NIC Driver"

1.8.5.3

From: Josh Boyer <[email protected]>
Date: Wed, 2 Apr 2014 11:24:00 -0400

Applied.