staging: wfx: simplify wfx_update_beaconing()

Remove most of indentation of wfx_update_beaconing() by reworking the
error handling.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200115135338.14374-19-Jerome.Pouiller@silabs.com


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