ath: Make ath_opmode_to_string understand OCB mode

Make ath_opmode_to_string return "OCB" for NL80211_IFTYPE_OCB. Currently
it will return "UNKNOWN".

Signed-off-by: Bertold Van den Bergh <[e-mail]>
Signed-off-by: Kalle Valo <[e-mail]>

drivers/net/wireless/ath/debug.c

···
 		return "P2P-CLIENT";
 	case NL80211_IFTYPE_P2P_GO:
 		return "P2P-GO";
+	case NL80211_IFTYPE_OCB:
+		return "OCB";
 	default:
 		return "UNKNOWN";
 	}