Fix group update issue

components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/service/GroupManagementProviderServiceImpl.java

@@ -194,8 +194,8 @@ public class GroupManagementProviderServiceImpl implements GroupManagementProvid
             GroupManagementDAOFactory.beginTransaction();
             DeviceGroup existingGroup = this.groupDAO.getGroup(groupId, tenantId);
             if (existingGroup != null) {
-                boolean existingGroupName = this.groupDAO.getGroup(deviceGroup.getName(), tenantId) != null;
-                if (existingGroupName) {
+                DeviceGroup existingGroupByName = this.groupDAO.getGroup(deviceGroup.getName(), tenantId);
+                if (existingGroupByName != null && existingGroupByName.getGroupId() != groupId) {
                     throw new GroupAlreadyExistException("Group already exists with name '" + deviceGroup.getName() + "'.");
                 }
                 List<DeviceGroup> groupsToUpdate = new ArrayList<>();