Bug 1510030 - Don't return the current opacity value from update_opacity_binding. r=gw

The return value is not used at all.

Differential Revision: https://phabricator.services.mozilla.com/D63600

--HG--
extra : moz-landing-system : lando

gfx/wr/webrender/src/prim_store/mod.rs

@@ -4306,13 +4306,10 @@ fn update_opacity_binding(
     opacity_bindings: &mut OpacityBindingStorage,
     opacity_binding_index: OpacityBindingIndex,
     scene_properties: &SceneProperties,
-) -> f32 {
-    if opacity_binding_index == OpacityBindingIndex::INVALID {
-        1.0
-    } else {
+) {
+    if opacity_binding_index != OpacityBindingIndex::INVALID {
         let binding = &mut opacity_bindings[opacity_binding_index];
         binding.update(scene_properties);
-        binding.current
     }
 }