node-hotplug: is memset 0 safe in try_offline_node()?

[Xishi Qiu]

When hot-remove a numa node, we will clear pgdat,
but is memset 0 safe in try_offline_node()?

process A:			offline node XX:
for_each_populated_zone()
find online node XX
cond_resched()
				offline cpu and memory, then try_offline_node()
				node_set_offline(nid), and memset(pgdat, 0, sizeof(*pgdat))
access node XX's pgdat
NULL pointer access error

Thanks,
Xishi Qiu

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