wifi: mac80211: unlock on error in ieee80211_can_powered_addr_change()

Unlock before returning -EOPNOTSUPP.

Fixes: 3c06e91b ("wifi: mac80211: Support POWERED_ADDR_CHANGE feature")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/iface.c

@@ -243,7 +243,7 @@ static int ieee80211_can_powered_addr_change(struct ieee80211_sub_if_data *sdata
 		 */
 		break;
 	default:
-		return -EOPNOTSUPP;
+		ret = -EOPNOTSUPP;
 	}
 
 unlock: