rcuupdate.h: Switch to READ_ONCE and fix NULL-deref in __task_pid_nr_ns() again

Submitted by Konstantin Khorenko on July 11, 2018, 3:43 p.m.

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Submitted July 11, 2018, 3:43 p.m.
Last Updated July 13, 2018, 10:31 p.m.
Revision 2

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