[tor-dev] test_memcpy() on Windows

[Gisle Vanem]

The 'test_memcpy()' in tinytest_demo.c assumes 
there is a NUL in one of the buffers. (the comment says so). That's 
not the case here on Windows. At least not in MSVC debug-mode 
where malloc'ed buffers are filled with '0xCD'. A snippet from my output:

../ext/tinytest_demo.c:159: assert(db->buffer1 < db->buffer2): 
    537472696E67203000CDCDCDCDCDCDCDCDCDCDCDCDCD
...
vs 537472696E67203000CDCDCDCDCDCDCDCDCDCDCDCD
...
  [memcpy FAILED]

I assume this test works on Linux where AFAICS malloc() returns a buffer 
with zeros. If so, shouldn't calloc() be used in 'setup_data_buffer()' instead?

--gv