Al Viro 6920a4405e namei: simplify failure exits in get_link()
when cookie is NULL, put_link() is equivalent to path_put(), so
as soon as we'd set last->cookie to NULL, we can bump nd->depth and
let the normal logics in terminate_walk() to take care of cleanups.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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