wifi: mac80211: Fix possible integer promotion issue

Fix a possible integer promotion issue in mac80211 in ieee80211_ml_epcs()

Fixes: de86c5f6 ("wifi: mac80211: Add support for EPCS configuration")
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Link: https://patch.msgid.link/20250214074721.1613549-1-ilan.peer@intel.com


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