Fix spacing & close sound file.

Adafruit_Video_Looper/video_looper.py

@@ -125,14 +125,13 @@ class VideoLooper(object):
                 # Get the video volume from the file in the usb key
                 sound_vol_file_path = '{0}/{1}'.format(path.rstrip('/'), self._sound_vol_file)
                 if os.path.exists(sound_vol_file_path):
-			sound_file = open(sound_vol_file_path, 'r')
+                    with open(sound_vol_file_path, 'r') as sound_file:
                         sound_vol_string = sound_file.readline()
                         if self._is_number(sound_vol_string):
                             self._sound_vol = int(float(sound_vol_string))
         # Create a playlist with the sorted list of movies.
         return Playlist(sorted(movies))
 
-
     def _blank_screen(self):
         """Render a blank screen filled with the background color."""
         self._screen.fill(self._bgcolor)