staging: wfx: drop useless loop

It is guarantee that the loop will stop at first iteration. So drop the
loop.

Fixes: 6bf418c5 ("staging: wfx: change the way to choose frame to send")
Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200529121603.1050891-2-Jerome.Pouiller@silabs.com


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