skmsg: Fix wrong last sg check in skmsgrecvmsg()
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 v5.15.66 by commit de22cba333d8699ad77e79f862fe1320cb1284de, it was introduced in version v5.15.61 by commit 293c53b7dbf9073cbcc488f938bc053ff4caeec0. For more details please see the references link.