Add comment on un-used return value.
Add comment on un-used return value.

psuriana/Halide,ronen/Halide,kgnk/Halide,jiawen/Halide,ronen/Halide,ronen/Halide,kgnk/Halide,psuriana/Halide,kgnk/Halide,ronen/Halide,psuriana/Halide,kgnk/Halide,jiawen/Halide,kgnk/Halide,psuriana/Halide,jiawen/Halide,kgnk/Halide,psuriana/Halide,ronen/Halide,ronen/Halide,kgnk/Halide,kgnk/Halide,jiawen/Halide,ronen/Halide,jiawen/Halide,jiawen/Halide,jiawen/Halide,psuriana/Halide,psuriana/Halide,ronen/Halide