Fix leak with VAOManager

Change-Id: I09f15de230c571adb580bdbb3250405f562f255b
Task-number: QTBUG-70892
Reviewed-by: Juan José Casafranca <juan.casafranca@kdab.com>
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

src/render/renderers/opengl/renderer/openglvertexarrayobject.cpp

@@ -108,6 +108,11 @@ void OpenGLVertexArrayObject::create(SubmissionContext *ctx, const VAOIdentifier
     m_owners = key;
 }
 
+VAOIdentifier OpenGLVertexArrayObject::key() const
+{
+    return m_owners;
+}
+
 // called from Render thread
 void OpenGLVertexArrayObject::destroy()
 {

src/render/renderers/opengl/renderer/openglvertexarrayobject_p.h

@@ -73,6 +73,7 @@ public:
     void release();
 
     void create(SubmissionContext *ctx, const VAOIdentifier &key);
+    VAOIdentifier key() const;
     void destroy();
     void cleanup();
 

src/render/renderers/opengl/renderer/renderer.cpp

@@ -2142,7 +2142,8 @@ void Renderer::cleanGraphicsResources()
         OpenGLVertexArrayObject *vao = m_nodesManager->vaoManager()->data(vaoHandle);
         if (vao) {
             vao->destroy();
-            m_nodesManager->vaoManager()->release(vaoHandle);
+            // We remove VAO from manager using its VAOIdentifier
+            m_nodesManager->vaoManager()->releaseResource(vao->key());
         }
     }
 }