Update Adafruit_CharLCD.py

Author: nichdu

Adafruit_CharLCD/Adafruit_CharLCD.py

@@ -144,7 +144,7 @@ def __init__(self, rs, en, d4, d5, d6, d7, cols, lines, backlight=None,
         # Setup backlight.
         if backlight is not None:
             if enable_pwm:
-                pwm.setup(backlight, self._pwm_duty_cycle(initial_backlight))
+                pwm.start(backlight, self._pwm_duty_cycle(initial_backlight))
             else:
                 gpio.setup(backlight, GPIO.OUT)
                 gpio.output(backlight, self._blpol if initial_backlight else not self._blpol)