ax25: fix UAF bug in ax25sendcontrol()
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 v5.15.35 by commit 1bf8946d5826788c82971977245bcd3313678eac, it was introduced in version v5.15.35 by commit 452ae92b99062d2f6a34324eaf705a3b7eac9f8b. For more details please see the references link.