Don't touch info->res_num if we are out of space.
Acked-by: NGary Hade <garyhade@us.ibm.com>
Tested-by: NGary Hade <garyhade@us.ibm.com>
Signed-off-by: NYinghai Lu <yinghai@kernel.org>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>