Merge branch 'net-ipv6-skip_notify_on_dev_down-fix'

Eric Dumazet says:

====================
net/ipv6: skip_notify_on_dev_down fix

While reviewing Matthieu Baerts recent patch [1], I found it copied/pasted
an existing bug around skip_notify_on_dev_down.

First patch is a stable candidate, and second one can simply land
in net tree.

https://lore.kernel.org/lkml/20230601-net-next-skip_print_link_becomes_ready-v1-1-c13e64c14095@tessares.net/
====================

Link: https://lore.kernel.org/r/20230601160445.1480257-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>