files: Initialize remap->is_dir for linked remap (to false)

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
files: Don't fail on missing fs.img for zombies

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
files: Don't unlink ghost directory

It will be rmdir-ed a bit later.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>