digitalio: Initialize direction to INPUT

None is an invalid direction

adafruit_seesaw/digitalio.py

@@ -31,7 +31,7 @@ def __init__(self, seesaw, pin):
         self._seesaw = seesaw
         self._pin = pin
         self._drive_mode = digitalio.DriveMode.PUSH_PULL
-        self._direction = False
+        self._direction = digitalio.Direction.INPUT
         self._pull = None
         self._value = False