fold destroy_super() into __put_super()

There's only one caller of destroy_super() left now.  Fold it there,
and replace those list_lru_destroy() calls with checks that they
had already been done (as they should have, when we were dropping
the last active reference).

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2017-10-11 13:48:55 -04:00
commit c645b93098