mm: zswap: remove unnecessary trees cleanups in zswap_swapoff()

During swapoff, try_to_unuse() makes sure that zswap_invalidate() is
called for all swap entries before zswap_swapoff() is called.  This means
that all zswap entries should already be removed from the tree.  Simplify
zswap_swapoff() by removing the trees cleanup code, and leave an assertion
in its place.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Yosry Ahmed <[email protected]>
Reviewed-by: Chengming Zhou <[email protected]>
Cc: Chris Li <[email protected]>
Cc: "Huang, Ying" <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Nhat Pham <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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