GSCArray: fix out-of-bounds access in GSCArrayQuickSort#47

DTW-Thalion wants to merge 2 commits into

gnustep:mastergnustep/libs-corebase:masterfrom

DTW-Thalion:fix/gscarray-quicksort-oobDTW-Thalion/libs-corebase:fix/gscarray-quicksort-oobCopy head branch name to clipboard