s3: smbd: Move implicit call to lp_posix_cifsu_locktype() out of init_strict_lock_str...

s3: smbd: Move implicit call to lp_posix_cifsu_locktype() out of init_strict_lock_struct().

Make it explicit. When we add POSIX handles to SMB2 we will only
look at the handle type. lp_posix_cifsu_locktype() already does this,
but hidden inside init_strict_lock_struct() makes it hard to see.

No logic change.

Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Noel Power <npower@samba.org>