netdev: check for nla_put_u32() failures

Make sure we check if nla_put_u32(id) was successful after creating
objects. This is theoretical today, the skbs are large enough to
always fit the ID.

Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org>
Reviewed-by: Joe Damato <joe@dama.to>
Link: https://patch.msgid.link/20260809000609.327659-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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