Merge branch 'ip-random-cleanup-for-devinet-c'

Kuniyuki Iwashima says:

====================
ip: Random cleanup for devinet.c

patch 1 ~ 3 remove defensive !ifa->ifa_dev tests.
patch 4 & 5 deduplicate common code.
====================

Link: https://patch.msgid.link/20240809235406.50187-1-kuniyu@amazon.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>