!4952 scsi: qedf: Add pointer checks in qedf_update_link_speed()

Merge Pull Request from: @ci-robot 
 
PR sync from: Li Nan <linan122@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/PB2SQMMWDCJAZ6EMA3FGXXIOZTHDV7IL/ 
 
https://gitee.com/src-openeuler/kernel/issues/I956GS 
 
Link:https://gitee.com/openeuler/kernel/pulls/4952

 

Reviewed-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Liu YongQiang <liuyongqiang13@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>