sfc/siena: fix null pointer dereference in efxhardstart_xmit
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.19.12 by commit a4eadca702dff0768dd01be6789bbec2a18e5b0a, it was introduced in version v5.10 by commit 12804793b17c0e19115a90d98f2f3df0cb79e233. For more details please see the references link.