Fix bug with failing to close FT232H on exit.
Fix bug with failing to close FT232H on exit.

steelee/Adafruit_Python_GPIO,aninternetof/rover-code,ehooo/Adafruit_Python_GPIO,nioinnovation/Adafruit_Python_GPIO,mjoldfield/Adafruit_Python_GPIO,aninternetof/rover-code,11zombie11/Adafruit,aninternetof/rover-code,adafruit/Adafruit_Python_GPIO