!7811 Input: synaptics-rmi4 - fix use after free in rmi_unregister_function()

Merge Pull Request from: @ci-robot 
 
PR sync from: Liu Chuang <liuchuang40@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/FGLB7W5SL7LXGCN6BVB7NX7QRXKEAHDQ/ 
 
https://gitee.com/openeuler/kernel/issues/I9RDP6 
 
Link:https://gitee.com/openeuler/kernel/pulls/7811

 

Reviewed-by: Liu YongQiang <liuyongqiang13@huawei.com>
Reviewed-by: Zhang Changzhong <zhangchangzhong@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>