[paint] Align deptch/edge count conditions across two backends

src/OT/Color/COLR/COLR.hh

@@ -2139,9 +2139,9 @@ struct COLR_accelerator_t : COLR::accelerator_t {
 void
 hb_paint_context_t::recurse (const Paint &paint)
 {
+  if (unlikely (depth_left <= 0 || edge_count <= 0)) return;
   depth_left--;
   edge_count--;
-  if (depth_left > 0 && edge_count > 0)
   paint.dispatch (this);
   depth_left++;
 }

src/hb-ft-colr.hh

@@ -90,8 +90,7 @@ struct hb_ft_paint_context_t
 
   void recurse (FT_OpaquePaint paint)
   {
-    if (depth_left <= 0) return;
-    if (edge_count <= 0) return;
+    if (unlikely (depth_left <= 0 || edge_count <= 0)) return;
     depth_left--;
     edge_count--;
     _hb_ft_paint (this, paint);