ax25: fix possible use-after-free

Patch applied successfully on Linux draws-f6bvp 4.14.79-v7+ #1159 SMP Sun Nov 4 17:50:20 GMT 2018 armv7l GNU/Linux However ax25_route_lock_use and ax25_route_lock_unuse() are not declared and compile failed. make : on entre dans le répertoire « /usr/src/linux-headers-4.14.79-v7+ » CC [M

[NetRom] possible circular locking dependency detected

Hi, When shutting down my dual core system, there was a possible circular locking dependency detected that is related to NetRom. Here is the syslog report. Regards, Bernard, f6bvp Oct 21 12:10:35 f6bvp-8 aprslist[1773]: terminating on SIGTERM Oct 21 12:10:35 f6bvp-8 fpacstat