e820_all_mapped need end is (addr + size) instead of (addr + size - 1)

Cc: stable@kernel.org
Acked-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NYinghai Lu <yinghai@kernel.org>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>