Revert "mm: memcontrol: fix NULL pointer crash in test_clear_page_writeback()"

This reverts commit d4a742865c6b69ef931694745ef54965d7c9966c.
LTS android-4.9.183 (a80a7ab) has conflicts with the reverted code.
They do the same thing, use LTS solution.

Change-Id: If64be3448dc5d4fdc66cb119aa46b52b341da8fd
Signed-off-by: jianzhou <jianzhou@codeaurora.org>
3 files changed