wifi: mac80211: don't WARN for late channel/color switch

There's really no value in the WARN stack trace etc., the reason
for this happening isn't directly related to the calling function
anyway. Also, syzbot has been observing it constantly, and there's
no way we can resolve it there - those systems are just slow.

Instead print an error message (once) and add a comment about what
really causes this message.

Reported-by:  <syzbot+468656785707b0e995df@syzkaller.appspotmail.com>
Reported-by:  <syzbot+18c783c5cf6a781e3e2c@syzkaller.appspotmail.com>
Reported-by:  <syzbot+d5924d5cffddfccab68e@syzkaller.appspotmail.com>
Reported-by:  <syzbot+7d73d99525d1ff7752ef@syzkaller.appspotmail.com>
Reported-by:  <syzbot+8e6e002c74d1927edaf5@syzkaller.appspotmail.com>
Reported-by:  <syzbot+97254a3b10c541879a65@syzkaller.appspotmail.com>
Reported-by:  <syzbot+dfd1fd46a1960ad9c6ec@syzkaller.appspotmail.com>
Reported-by:  <syzbot+85e0b8d12d9ca877d806@syzkaller.appspotmail.com>
Link: https://patch.msgid.link/20250617104902.146e10919be1.I85f352ca4a2dce6f556e5ff45ceaa5f3769cb5ce@changeid


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