[PATCH] ieee80211: fix incomplete error message

Fix error message:
Unable to network device. --> Unable to allocate network device.

Cc: James Ketrenos <jketreno@linux.intel.com>
Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

net/ieee80211/ieee80211_module.c

@@ -140,7 +140,7 @@ struct net_device *alloc_ieee80211(int sizeof_priv)
 
 	dev = alloc_etherdev(sizeof(struct ieee80211_device) + sizeof_priv);
 	if (!dev) {
-		IEEE80211_ERROR("Unable to network device.\n");
+		IEEE80211_ERROR("Unable to allocate network device.\n");
 		goto failed;
 	}
 	ieee = netdev_priv(dev);