[PATCH] msvcrt: Handle overflow in calloc()

[Marvin]

Hi,

While running your changed tests on Windows, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?
Full results can be found at
https://testbot.winehq.org/JobDetails.pl?Key=22628

Your paranoid android.


=== wxppro (32 bit heap) ===
heap.c:478: Test failed: got errno 0

=== w2003std (32 bit heap) ===
heap.c:478: Test failed: got errno 0