Patch to fix complaints from valgrind about make check for randist

[Brian Gough]

Jonathan G. Underwood writes:
 > Another (trivial) patch to fix valgrind errors for make check in randist.

Thanks, I'll add those in.  Most of the errors I've seen with valgrind
were related to "long double". I decided that it didn't seem to handle
that type correctly as the same code doesn't generate any errors with
other types.

-- 
Brian Gough