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add calloc integer overflow check

Peter Limkilde Svendsen requested to merge plimkilde/relibc:calloc_overflow_check into master

Check for integer overflow in the size calculation in calloc().

Added a test using SIZE_MAX, SIZE_MAX as arguments, expecting a null pointer as output. As the overflowing result of SIZE_MAX*SIZE_MAX is just 1, the null pointer can be reasonably expected not to originate from an underlying failed malloc() call.

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