sfc: fix considering that all channels have TX queues

sfc: fix considering that all channels have TX queues

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 v5.18.4 by commit 913d45f02d346ce41c4aad057eaf53a8ed449dc3, it was introduced in version v5.5 by commit 8700aff089843399f95bc7701ae87b642b35a716. For more details please see the references link.