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   Make the direct-map API always available, but fail if KASAN or rump.

   (Only for architectures that support it at all; on others,
   __HAVE_MM_MD_DIRECT_MAPPED_PHYS/IO are still undefined and the
   functions unimplemented.)

   This gives modules like zfs an opportunity to use it.

   While here, fix the one caller of mm_md_direct_mapped_phys that
   ignored the return value (and make sure to call pmap_kremove/update
   before uvm_km_free).

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