[gtk/wip/chergert/glproto: 354/526] igmore zero case

[Christian Hergert <chergert src gnome org>]

commit 51446db2420676c90076eb6e2c7fcc312fbc5abc
Author: Christian Hergert <chergert redhat com>
Date:   Thu Jan 28 21:32:37 2021 -0800

    igmore zero case

 gsk/next/ninesliceprivate.h | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/gsk/next/ninesliceprivate.h b/gsk/next/ninesliceprivate.h
index 2bf1c006ff..d0f55545ed 100644
--- a/gsk/next/ninesliceprivate.h
+++ b/gsk/next/ninesliceprivate.h
@@ -151,6 +151,9 @@ static inline void
 nine_slice_grow (GskGLTextureNineSlice *slices,
                  int                    amount)
 {
+  if (amount == 0)
+    return;
+
   /* top left */
   slices[0].rect.x -= amount;
   slices[0].rect.y -= amount;