af_unix: introduce and use scm_replace_pid() helper

Existing logic in __scm_send() related to filling an struct scm_cookie
with a proper struct pid reference is already pretty tricky. Let's
simplify it a bit by introducing a new helper. This helper will be
extended in one of the next patches.

Cc: [email protected]
Cc: [email protected]
Cc: David S. Miller <[email protected]>
Cc: Eric Dumazet <[email protected]>
Cc: Jakub Kicinski <[email protected]>
Cc: Paolo Abeni <[email protected]>
Cc: Simon Horman <[email protected]>
Cc: Willem de Bruijn <[email protected]>
Cc: Leon Romanovsky <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Christian Brauner <[email protected]>
Cc: Kuniyuki Iwashima <[email protected]>
Cc: Lennart Poettering <[email protected]>
Cc: Luca Boccassi <[email protected]>
Cc: David Rheinsberg <[email protected]>
Signed-off-by: Alexander Mikhalitsyn <[email protected]>
Link: https://lore.kernel.org/[email protected]
Reviewed-by: Kuniyuki Iwashima <[email protected]>
Signed-off-by: Christian Brauner <[email protected]>

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