Fix off-by-one error in HexagonOffload
Fix off-by-one error in HexagonOffload

we want buffer_get_extent(), not buffer_get_max(), to get the size of
the code buffer

kgnk/Halide,psuriana/Halide,kgnk/Halide,kgnk/Halide,kgnk/Halide,kgnk/Halide,psuriana/Halide,psuriana/Halide,psuriana/Halide,kgnk/Halide,psuriana/Halide,kgnk/Halide,psuriana/Halide,kgnk/Halide,psuriana/Halide