Merge branch 'mctp-sockaddr-padding-check-initialisation-fixup'

Eugene Syromiatnikov says:

====================
MCTP sockaddr padding check/initialisation fixup

This pair of patches introduces checks for padding fields of struct
sockaddr_mctp/sockaddr_mctp_ext to ease their re-use for possible
extensions in the future;  as well as zeroing of these fields
in the respective sockaddr filling routines.  While the first commit
is definitely an ABI breakage, it is proposed in hopes that the change
is made soon enough (the interface appeared only in Linux 5.15)
to avoid affecting any existing user space.
====================

Link: https://lore.kernel.org/r/cover.1635965993.git.esyr@redhat.com


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