[nrf noup] wifi: avoid unwanted connect request

It's pointless to issue a connect request in case
no valid SSID has been found.

Signed-off-by: Marcin Kajor <marcin.kajor@nordicsemi.no>

src/platform/nrfconnect/wifi/WiFiManager.cpp

@@ -397,6 +397,7 @@ void WiFiManager::ScanDoneHandler(Platform::UniquePtr<uint8_t> data)
                 ChipLogProgress(DeviceLayer, "Starting connection recover: re-scanning... (next attempt in %d ms)",
                                 currentTimeout.count());
                 DeviceLayer::SystemLayer().StartTimer(currentTimeout, Recover, nullptr);
+                return;
             }
 
             Instance().mWiFiState = WIFI_STATE_ASSOCIATING;