staging: wfx: drop useless wfx_fwd_probe_req()

wfx_fwd_probe_req() is a function of two lines called from only one
place. In order to uniformize all filtering functions, drop
wfx_fwd_probe_req().

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200415161147.69738-12-Jerome.Pouiller@silabs.com


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