iw: fix mgmt dump missing arguments segfault

When expected arguments for mgmt command dump are left out iw segfaults.

Example: iw dev wlp2s0 mgmt dump frame e0

This fixes it.

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