tdehwlib: Prevent potential crash, when building without Network Manager support.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 2b3ea27bdf)

tdecore/tdehw/tdenetworkconnections.cpp

@@ -1097,9 +1097,14 @@ TDENetworkWiFiAPInfo* TDEGlobalNetworkManager::findAccessPointByBSSID(TDEMACAddr
 		TDENetworkDevice* dev = dynamic_cast<TDENetworkDevice*>(*it);
 		if (dev) {
 			TDENetworkConnectionManager* deviceConnMan = dev->connectionManager();
+			if (deviceConnMan)
+			{
 				TDENetworkWiFiAPInfo* candidate = deviceConnMan->findAccessPointByBSSID(bssid);
-			if (candidate) {
+				if (candidate)
+				{
 					ret = candidate;
+					break;
+				}
 			}
 		}
 	}