GSD-2021-1001966 net: batman-adv: fix error handling

net: batman-adv: fix error handling 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 v4.14.254 by commit e50f957652190b5a88a8ebce7e5ab14ebd0d3f00...