Fix another case where debug lines were displayed

plugins/check_disk.cpp

@@ -313,7 +313,7 @@ int check_drives(vector<drive>& vDrives)
 		sDrives.insert(wstring(szVolumePathNames));
 		FindNextVolume(hVolume, szVolumeName, MAX_PATH);
 	}
-
+	if (debug)
 		wcout << L"Creating vector from found volumes, removing cd drives etc.:" << endl;
 	for (set<wstring>::iterator it = sDrives.begin(); it != sDrives.end(); ++it) {
 		UINT type = GetDriveType(it->c_str());

plugins/check_update.cpp

@@ -256,7 +256,7 @@ int check_update(printInfoStruct& printInfo)
 
 	SysFreeString(criteria);
 	CoUninitialize();
-	return 0;
+	return -1;
 
 die:
 	die(err);