wifi: mac80211: fix ifdef symbol name

This should of course be CONFIG_, not CPTCFG_, which is an
artifact from working with backports.

Fixes: 9dd19538 ("wifi: nl80211/mac80211: clarify link ID in control port TX")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/tx.c

@@ -2971,7 +2971,7 @@ static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
 
 		if (pre_conf_link_id != link_id &&
 		    link_id != IEEE80211_LINK_UNSPECIFIED) {
-#ifdef CPTCFG_MAC80211_VERBOSE_DEBUG
+#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 			net_info_ratelimited("%s: dropped frame to %pM with bad link ID request (%d vs. %d)\n",
 					     sdata->name, hdr.addr1,
 					     pre_conf_link_id, link_id);