Web API: fixed webapiSettingsGet not initializing own channel or device structure

plugins/samplesink/hackrfoutput/hackrfoutput.cpp

@@ -473,6 +473,7 @@ int HackRFOutput::webapiSettingsGet(
                 QString& errorMessage __attribute__((unused)))
 {
     response.setHackRfOutputSettings(new SWGSDRangel::SWGHackRFOutputSettings());
+    response.getHackRfOutputSettings()->init();
     webapiFormatDeviceSettings(response, m_settings);
     return 200;
 }