cfg80211: add missing break in cfg80211_get_chan_state()

Improve readability of the function by adding the break,
there's no functional impact but it's confusing to fall
through.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/wireless/chan.c

@@ -599,6 +599,7 @@ cfg80211_get_chan_state(struct wireless_dev *wdev,
 				  : CHAN_MODE_EXCLUSIVE;
 			return;
 		}
+		break;
 	case NL80211_IFTYPE_STATION:
 	case NL80211_IFTYPE_P2P_CLIENT:
 		if (wdev->current_bss) {