Fixed NPE issue

components/device-mgt/org.wso2.carbon.device.mgt.mobile.impl/src/main/java/org/wso2/carbon/device/mgt/mobile/dao/util/MobileDeviceManagementDAOUtil.java

@@ -93,7 +93,7 @@ public class MobileDeviceManagementDAOUtil {
     public static void setupMobileDeviceManagementSchema(DataSource dataSource, String pluginType) throws MobileDeviceMgtPluginException {
         MobileDeviceManagementSchemaInitializer initializer =
                 new MobileDeviceManagementSchemaInitializer(dataSource, pluginType);
-        log.info("Initializing mobile device management repository database schema for " + dataSource);
+        log.info("Initializing mobile device management repository database schema for : " + pluginType);
         try {
             initializer.createRegistryDatabase();
         } catch (Exception e) {