cxgb4: allocate more space for MSI-X interrupt names

Currently MSI-X names for netdevs with long names are truncated in
/proc/interrupts due to insufficient space.  Use IFNAMSIZ to size the
needed space.
Signed-off-by: NDimitris Michailidis <dm@chelsio.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/cxgb4/cxgb4.h

@@ -497,7 +497,7 @@ struct adapter {
 
 	struct {
 		unsigned short vec;
-		char desc[14];
+		char desc[IFNAMSIZ + 10];
 	} msix_info[MAX_INGQ + 1];
 
 	struct sge sge;