cfg80211: add debug print when disabling a channel on a custom regd

Cc: Easwar Krishnan <easwar.krishnan@atheros.com>
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/wireless/reg.c

@@ -1125,6 +1125,11 @@ static void handle_channel_custom(struct wiphy *wiphy,
 			       regd);
 
 	if (r) {
+		REG_DBG_PRINT("cfg80211: Disabling freq %d MHz as custom "
+			      "regd has no rule that fits a %d MHz "
+			      "wide channel\n",
+			      chan->center_freq,
+			      KHZ_TO_MHZ(desired_bw_khz));
 		chan->flags = IEEE80211_CHAN_DISABLED;
 		return;
 	}