staging: r8188eu: change another function param from __queue to list_head

staging: r8188eu: change another function param from __queue to list_head

Modify the rtw_free_xmitframe_queue function to take a list_head pointer
instead of a __queue pointer.

This is an intermediate step towards changing struct tx_servq's
sta_pending from __queue to list_head.

Now that the function takes a list instead of a queue, we should also
rename it to rtw_free_xmitframe_list.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20230130195303.138941-4-martin@kaiser.cx
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>