Fixes: Commit 2aa6d036 ("mm: numa: avoid waiting on freed migrated pages")

Commit 2aa6d036 ("mm: numa: avoid waiting on freed migrated pages")
was an incomplete backport of the upstream commit.  It is necessary to
always reset page_nid before attempting any early exit.

The original commit conflicted due to lack of commit 82b0f8c39a38
("mm: join struct fault_env and vm_fault") in 4.9 so it wasn't a clean
application, and the change must have just gotten lost in the noise.

Signed-off-by: Chas Williams <chas3@att.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>