fix the garbled output caused by the usage of mixed output buffer (#707)
fix the garbled output caused by the usage of mixed output buffer (#707)


rsas/souper,jubitaneja/souper,regehr/souper,jubitaneja/souper,jubitaneja/souper,rsas/souper,regehr/souper,rsas/souper,google/souper,google/souper,google/souper,google/souper,rsas/souper,regehr/souper,google/souper,regehr/souper,jubitaneja/souper,jubitaneja/souper,jubitaneja/souper,regehr/souper,rsas/souper,rsas/souper