rtlwifi: rtl8192cu: Free ieee80211_hw if probing fails

In case of an error, no one will use the allocated structure. Call
ieee80211_free_hw, same as in rtl_usb_disconnect.
Signed-off-by: Reto Schneider <code@reto-schneider.ch>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200622132113.14508-4-code@reto-schneider.ch

drivers/net/wireless/realtek/rtlwifi/usb.c

@@ -1087,6 +1087,7 @@ int rtl_usb_probe(struct usb_interface *intf,
 	usb_put_dev(udev);
 	complete(&rtlpriv->firmware_loading_complete);
 	kfree(rtlpriv->usb_data);
+	ieee80211_free_hw(hw);
 	return -ENODEV;
 }
 EXPORT_SYMBOL(rtl_usb_probe);