Fix a driver bug which could result in frames MHLEN or (MHLEN - 1) bytes long being DMA'ed 2 (or 1) bytes past the end of the mbuf and corrupting random kernel memory.  I had forgotten about the 2 bytes of implict padding the firmware assumes.
Fix a driver bug which could result in frames MHLEN or (MHLEN - 1) bytes
long being DMA'ed 2 (or 1) bytes past the end of the mbuf and corrupting
random kernel memory.  I had forgotten about the 2 bytes of implict
padding the firmware assumes.

Sponsored by: Myricom Inc.

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