[Accton AS4630-54PE] Fix Python indentation error (#4393)

Fix Python indentation error
Add newline at EOF

platform/broadcom/sonic-platform-modules-accton/as4630-54pe/classes/fanutil.py

@@ -83,7 +83,7 @@ class FanUtil(object):
         device_path = self.get_fan_device_path(fan_num, node_num)
        
             try:
-            val_file = open(device_path, 'r')
+                val_file = open(device_path, 'r')
             except IOError as e:
                 logging.error('GET. unable to open file: %s', str(e))
                 return None
@@ -200,4 +200,4 @@ def main():
         logging.debug('fan-%d status=%d', i, fan.get_fan_status(i))
     
 if __name__ == '__main__':
-    main()
+    main()