[CRIU] [PATCH] page-read: fix open_page_read usage

[Cyrill Gorcunov]

On Sat, Jun 25, 2016 at 11:26:35AM +0300, Pavel Tikhomirov wrote:
> 1. Fix uninitialized use of pr in cr_dedup_one_pagemap and get_page:
> https://github.com/xemul/criu/issues/178
> 2. If open_page_read ret is >0 pr.close is initialized so there is no
> point to test it before use
> 3. In find_vmas fix pr leak in case of error returned from
> collect_uffd_pages
> 
> Signed-off-by: Pavel Tikhomirov <ptikhomirov at virtuozzo.com>
Reviewed-by: Cyrill Gorcunov <gorcunov at openvz.org>