wifi: mac80211: move code in ieee80211_link_reserve_chanctx to a helper

Reduces indentation in preparation for further changes

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Link: https://patch.msgid.link/cce95007092336254d51570f4a27e05a6f150a53.1720514221.git-series.nbd@nbd.name


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