size-efficient, and will probably be rewritten.

The md5.c from MatrixSSL is too ugly to consider importing.

skip past an empty region, otherwise we end up generating an infinitely
long e820 map.  (Yes, there *are* real systems that provide e820 maps
with a zero-length region at the end...)

list.

actually do anything with the result, since it carried on using us
even when we returned failure).

actually do anything with the result, since it carried on using us
even when we returned failure).