libweston: fix indentation

Signed-off-by: Tomohito Esaki <etom@igel.co.jp>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
diff --git a/libweston/compositor.c b/libweston/compositor.c
index 101096c..d11a655 100644
--- a/libweston/compositor.c
+++ b/libweston/compositor.c
@@ -2546,13 +2546,13 @@
 	}
 
 	if (ret == 0) {
-	    if (compositor->backend->repaint_flush)
-		    compositor->backend->repaint_flush(compositor,
-						       repaint_data);
+		if (compositor->backend->repaint_flush)
+			compositor->backend->repaint_flush(compositor,
+							   repaint_data);
 	} else {
-	    if (compositor->backend->repaint_cancel)
-		    compositor->backend->repaint_cancel(compositor,
-						        repaint_data);
+		if (compositor->backend->repaint_cancel)
+			compositor->backend->repaint_cancel(compositor,
+							    repaint_data);
 	}
 
 	output_repaint_timer_arm(compositor);