Fix clang -Wcomma warnings (#471) (#472) clang's new -Wcomma compiler option warns about possible misuse of the comma operator such as between two statements. hb-common.cc:190:9 [-Wcomma] possible misuse of comma operator here hb-ot-layout-gsubgpos-private.hh:345:30 [-Wcomma] possible misuse of comma operator here hb-shape-plan.cc:438:26 [-Wcomma] possible misuse of comma operator here