[SRU Request] vrf: fix refcnt leak with vxlan slaves

[Nicolas Dichtel]

Hi Ubuntu kernel team,

please, could you consider to backport the linux upstream commit b87b04f5019e
("ipv4: Fix device used for dst_alloc with local routes"):

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b87b04f5019e

It is included in linux v5.13. The bug exists since linux v4.10.

Here is the launchpad entry:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1945180

Enclosed to the LP entry is a backport above Ubuntu-hwe-5.4-5.4.0-87.98_18.04.1.

Thank you,
Nicolas