Revert "mm: bugfix: set current->reclaim_state to NULL while returning from kswapd()"

This reverts commit 8501b1f6d7fe2ee7cbdb9f87543fb84f1abafa03.
Revert "Revert "mm: bugfix: set current->reclaim_state to NULL while returning from kswapd()""

This reverts commit feb8a5f0eb345fa41f5b17f5f6ba41c9f48396e8.
staging: lmk: revert back to prior version