rtlwifi: Don't leak on error in _rtl_usb_receive()

We fail to release 'urb' if '_rtl_prep_rx_urb()' fails in
_rtl_usb_receive().
This patch should take care of the leak.

Signed-off-by: Jesper Juhl <[email protected]>
Acked-by: Larry Finger <[email protected]>
Signed-off-by: John W. Linville <[email protected]>

Author: jjuhl

drivers/net/wireless/rtlwifi/usb.c

@@ -639,6 +639,7 @@ static int _rtl_usb_receive(struct ieee80211_hw *hw)
 			RT_TRACE(rtlpriv, COMP_USB, DBG_EMERG,
 				 "Failed to prep_rx_urb!!\n");
 			err = PTR_ERR(skb);
+			usb_free_urb(urb);
 			goto err_out;
 		}