iw: fix ftm_request missing arguments segfault

When expected argument <config-file> is not passed to arguemts iw
segfaults.

Example: iw wlp2s0 measurement ftm_request

This fixes it.

Signed-off-by: Benjamin Aschenbrenner <benjamin.aschenbrenner@gmail.com>
Link: https://lore.kernel.org/r/20210410111937.32813-2-benjamin.aschenbrenner@gmail.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
1 file changed