[tor-dev] test_memcpy() on Windows

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