CVE-2021-47077 scsi: qedf: Add pointer checks in qedf_update_link_speed()

In the Linux kernel, the following vulnerability has been resolved: scsi: qedf: Add pointer checks in qedfupdatelinkspeed The following trace was observed: 14.042059 Call Trace: 14.042061 14.042068 qedflinkupdate+0x144/0x1f0 qedf 14.042117 qedlinkupdate+0x5c/0x80 qed 14.042135...