Merge branch 'amt-fix-several-bugs-in-gateway-mode'

Taehee Yoo says:

====================
amt: fix several bugs in gateway mode

This patchset fixes bugs in amt module.

First patch fixes amt gateway mode's status stuck.
amt gateway and relay established so these two mode manage status.
But gateway stuck to change its own status if a relay doesn't send
responses.

Second patch fixes a memory leak.
amt gateway skips some handling of advertisement message.
So, a memory leak would occur.
====================

Link: https://lore.kernel.org/r/20220519031555.3192-1-ap420073@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>