Only update the texture if the m_glResources are valid

Change-Id: Ifa0c768e2f0299d31d3d52db975c896bdb2aab5e
Reviewed-by: Yoann Lopes <yoann.lopes@qt.io>

src/plugins/common/evr/evrd3dpresentengine.cpp

@@ -255,7 +255,7 @@ QVariant IMFSampleVideoBuffer::handle() const
     if (handleType() != GLTextureHandle)
         return handle;
 
-    if (m_textureUpdated || m_engine->updateTexture(m_surface)) {
+    if (m_engine->m_glResources && (m_textureUpdated || m_engine->updateTexture(m_surface))) {
         m_textureUpdated = true;
         handle = QVariant::fromValue<unsigned int>(m_engine->m_glResources->glTexture);
     }