cg: props -- Handle use after free on error path in cgp_handle_props caller

 | *** CID 161427:  Memory - corruptions  (USE_AFTER_FREE)
 | /criu/cgroup-props.c: 352 in cgp_parse_stream()
 | 346
 | 347             ret = 0;
 | 348     out:
 | 349             return ret;
 | 350
 | 351     err_parse:
 | >>>     CID 161427:  Memory - corruptions  (USE_AFTER_FREE)
 | >>>     Calling "cgp_free" frees pointer "cgp_entry" which has already been freed.
 | 352             cgp_free(cgp_entry);
 | 353             ret = -EINVAL;
 | 354             goto out;
 | 355     }
 | 356
 | 357     static int cgp_parse_file(char *path)

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>