staging: wfx: simplify wfx_conf_tx()

Error management of wfx_conf_tx() can be simplified.

In add, the hardware command "hif_set_edca_queue_params" never returns
any error.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20191217161318.31402-38-Jerome.Pouiller@silabs.com


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