vfs: Copy struct mount.mnt_id to userspace using put_user()

The mnt_id field can be copied with put_user(), so there is no need to
use copy_to_user(). In both cases, hardened usercopy is being bypassed
since the size is constant, and not open to runtime manipulation.

This patch is verbatim from Brad Spengler/PaX Team's PAX_USERCOPY
whitelisting code in the last public patch of grsecurity/PaX based on my
understanding of the code. Changes or omissions from the original code are
mine and don't reflect the original grsecurity/PaX code.

Signed-off-by: David Windsor <[email protected]>
[kees: adjust commit log]
Cc: Alexander Viro <[email protected]>
Cc: [email protected]
Signed-off-by: Kees Cook <[email protected]>

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