mm-sparsemem-fix-a-bug-in-free_map_bootmem-when-config_sparsemem_vmemmap-v2

mm-sparsemem-fix-a-bug-in-free_map_bootmem-when-config_sparsemem_vmemmap-v2

v2: Fix a bug introduced in v1 patch. Thanks wanpeng!

Signed-off-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Cc: Wen Congyang <wency@cn.fujitsu.com>
Cc: Tang Chen <tangchen@cn.fujitsu.com>
Cc: Toshi Kani <toshi.kani@hp.com>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Yasunori Goto <y-goto@jp.fujitsu.com>
Cc: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>