cifs: fix small mempool leak in SMB2_negotiate()
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 9e3c9efa7caf16e5acc05eab5e4d0a714e1610b0. For more details please see the references link.