Gin ShouldBindJSON return nil error

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Description

How to reproduce

package main

import (
    "github.com/gin-gonic/gin"
)
type CreatePlaybackRecordReq struct {
    Data []DeviceRecordList `json:"data"`
}

func CreatePlaybackRecord(c *gin.Context) {
    var req *CreatePlaybackRecordReq
    if err := c.ShouldBindJSON(&req); err != nil {
        c.Status(http.StatusBadRequest)
        return
    }

    for _, deviceRecord := range req.Data {
         .....
        }
}

panic happend at line

for _, deviceRecord := range req.Data 

Expectations

Environment

• go version: 1.17
• gin version (or commit ref): v1.6.3
• operating system:

Comment From: CCpro10

I think you should var req CreatePlaybackRecordReq, not var req *CreatePlaybackRecordReq