Fix multiplication in memoverride calloc macro #1669
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Without this change, a call such as `calloc( 1 + 1, 2 )` will allocate 3 bytes ( `1 + 1 * 2`) and then memset 4 bytes ( `(1 + 1) * 2` ), overflowing the buffer & corrupting the heap.
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Without this change, a seemingly-innocent call such as
calloc( 1 + 1, 2 )will allocate 3 bytes (1 + 1 * 2) and then memset 4 bytes ((1 + 1) * 2), overflowing the buffer & corrupting the heap.I don't believe any code in this repo is currently doing math in the calloc callsite like this.