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Avoid possible overflow with ltsGetFreeBlock() in logtape.c
nFreeBlocks, defined as a long, stores the number of free blocks in alogical tape. ltsGetFreeBlock() has been using an int to store thevalue of nFreeBlocks, which could lead to overflows on platforms wherelong and int are not the same size (in short everything except Windowswhere long is 4 bytes).The problematic intermediate variable is switched to be a long insteadof an int.Issue introduced byc02fdc9, so backpatch down to 13.Author: Ranier vilelaReviewed-by: Peter Geoghegan, David RowleyDiscussion:https://postgr.es/m/CAEudQApLDWCBR_xmwNjGBrDo+f+S4E87x3s7-+hoaKqYdtC4JQ@mail.gmail.comBackpatch-through: 131 parent3d895f9 commitd2bd4ba
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