John Baldwin 9afa8f431f - Unmap static DMA buffers allocated via bus_dmemem_alloc() before
freeing them instead of after.
- Check the bus address of a static DMA buffer to decide if the associated
  map should be unloaded.
- Don't try to destroy bus dma maps for static DMA buffers.

Reviewed by:	davidcs
2014-06-11 20:46:23 +00:00
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