Fix dup err logic

Signed-off-by: Asai Neko <sugar@sne.moe>

middleware/jwt.go

@@ -18,7 +18,7 @@ func JWTAuth() gin.HandlerFunc {
 			return
 		}
 
-		if err == nil && uid == "" {
+		if uid == "" {
 			c.Set("user_id", "")
 			c.Next()
 			return

service/user/checkin.go

@@ -83,7 +83,7 @@ func CheckinSubmit(c *gin.Context) {
 	c.ShouldBindJSON(&req)
 
 	attendanceData := new(data.Attendance)
-	err := attendanceData.VerifyCheckinCode(req.ChekinCode)
+	err = attendanceData.VerifyCheckinCode(req.ChekinCode)
 	if err != nil {
 		c.JSON(400, gin.H{
 			"status": "error verify checkin code",