itg3200: fix incorrect ifdef comment

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

include/linux/iio/gyro/itg3200.h

@@ -149,6 +149,6 @@ static inline void itg3200_buffer_unconfigure(struct iio_dev *indio_dev)
 {
 }
 
-#endif  /* CONFIG_IIO_RING_BUFFER */
+#endif  /* CONFIG_IIO_BUFFER */
 
 #endif /* ITG3200_H_ */