[PATCH](memory hotplug) Fix unnecessary calling of init_currenty_empty_zone()

Hello. This patch is to fix unnecessary calling of init_currently_empty_zone(). zone->present_pages is updated in online_pages(). But, __add_zone() can be called twice or more before calling online_pages(). So, init_currenty_empty_zone() can be called unnecessary times. It is cause of memory

[PATCH](memory hotplug) Fix unnecessary calling of init_currenty_empty_zone()

Hello. This patch is to fix unnecessary calling of init_currently_empty_zone(). zone-present_pages is updated in online_pages(). But, __add_zone() can be called twice or more before calling online_pages(). So, init_currenty_empty_zone() can be called unnecessary times. It is cause of memory leak