staging: mt7621-dma: Fix ident by space

Fixes checkpatch error: CODE_IDENT
Signed-off-by: Christian Lütke-Stetzkamp <christian@lkamp.de>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/mt7621-dma/ralink-gdma.c

@@ -909,7 +909,7 @@ static int gdma_dma_remove(struct platform_device *pdev)
 	struct gdma_dma_dev *dma_dev = platform_get_drvdata(pdev);
 
 	tasklet_kill(&dma_dev->task);
-        of_dma_controller_free(pdev->dev.of_node);
+	of_dma_controller_free(pdev->dev.of_node);
 	dma_async_device_unregister(&dma_dev->ddev);
 
 	return 0;