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mm, swap: refactor swapoff + add xswap_destroy

  1. Extract __swapoff() from sys_swapoff(): the core teardown logic now lives in __swapoff(), shared by sys_swapoff() and the new xswap_destroy(). swap_file operations are guarded with NULL chec
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← mm, swap: defer xswap shrink to workqueue to avoid lock recursion
mm, swap: require zswap for xswap devices →