staging: wfx: fix warning of line over 80 characters

Fix warning of lines over 80 characters.
Issue detected by checkpatch tool.

Signed-off-by: Jules Irenge <jbi.octave@gmail.com>
Link: https://lore.kernel.org/r/20191019140719.2542-3-jbi.octave@gmail.com


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