staging: wimax: fix code style issues

Fixes 'WARNING: Missing a blank line after declarations' generated by
checkpatch.pl script.

Signed-off-by: Hassan Shahbazi <h.shahbazi.git@gmail.com>
Link: https://lore.kernel.org/r/20210223064227.62631-1-h.shahbazi.git@gmail.com


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