Merge branch 'net-more-heap-allocation-and-split-of-rtnl_newlink'

Jakub Kicinski says:

====================
net: more heap allocation and split of rtnl_newlink()

Small refactoring of rtnl_newlink() to fix a stack usage warning
and make the function shorter.
====================

Link: https://lore.kernel.org/r/20220429235508.268349-1-kuba@kernel.org


Signed-off-by: Paolo Abeni <pabeni@redhat.com>