staging: wfx: uniformize queue_id retrieval

tx_info->hw_queue contains "vif.hw_queue[skb_get_queue_mapping(skb)]".
For now, it is equivalent of "skb_get_queue_mapping(skb)". However, it
is not the same semantic. In wfx_tx_inner(), we want to get the mac80211
queue index, not the hardware queue index.

Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200401110405.80282-6-Jerome.Pouiller@silabs.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>