add update sort

sunty

2020-01-14 3bed24d4a41be6aaa6c02efd76d0091197b3ee73

 controllers/camera.go

@@ -351,6 +351,7 @@
               "cameraId": cid,
               "snapshotUrl": file.SnapshotUrl,
            })
            return
         } else {
            util.ResponseFormat(c, code.ComError, "更新失败")
            return