staging: iio: accel: Remove explicit comparisons

Remove comparisons to 0 or NULL
Signed-off-by: Cristina Moraru <cristina.moraru09@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/iio/accel/sca3000_ring.c

@@ -267,7 +267,7 @@ int sca3000_configure_ring(struct iio_dev *indio_dev)
 	struct iio_buffer *buffer;
 
 	buffer = sca3000_rb_allocate(indio_dev);
-	if (buffer == NULL)
+	if (!buffer)
 		return -ENOMEM;
 	indio_dev->modes |= INDIO_BUFFER_HARDWARE;