mac80211: remove useless ieee80211_vif_is_mesh() check

We check ieee80211_vif_is_mesh() at the top if() block,
there's no need to check for it again.

Signed-off-by: Baligh Gasmi <gasmibal@gmail.com>
Link: https://lore.kernel.org/r/20220203153035.198697-1-gasmibal@gmail.com


Signed-off-by: Johannes Berg <johannes.berg@intel.com>