GSD-2022-1002203 ax25: fix UAF bug in ax25_send_control()

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 v5.4.190 by commit eaa7eb23fa76db45f7da1b6192518705863d0ebe...