Avoid a possible overflow (src/backend/utils/sort/logtape.c)

[Ranier Vilela]

Hi,

nFreeBlocks stores the number of free blocks and
your type is *long*.

At Function ltsGetFreeBlock is locally stored in
heapsize wich type is *int*

With Windows both *long* and *int* are 4 bytes.
But with Linux *long* is 8 bytes and *int* are 4 bytes.

patch attached.

best regards,
Ranier Vilela

0001-Avoid-possible-overflow-with-ltsGetFreeBlock-functio.patch
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