!2500 Modify a format problem of gpio

Merge Pull Request from: @lujunhuaHW 
 
The hisi_gpio->line is unsigned int so the format specifier
should have been %u not %d. 
 
Link:https://gitee.com/openeuler/kernel/pulls/2500

 

Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>