src/player/mpvplayer: fix returning node with null texture

If mpv's render didn't have a texture ready for updatePaintNode, it
would return a null texture. This fixes the issue by calling the base
class implementation of updatePaintNode. This isn't visible to the user,
but it does save the trouble of having an error printed to console and
handled by Qt.

Author: ripose-jp

src/player/mpvplayer.cpp

@@ -649,8 +649,7 @@ void MpvPlayer::doUpdate()
 }
 
 #ifdef Q_OS_MACOS
-QSGNode *MpvPlayer::updatePaintNode(
-    QSGNode *oldNode, [[maybe_unused]] UpdatePaintNodeData *data)
+QSGNode *MpvPlayer::updatePaintNode(QSGNode *oldNode, UpdatePaintNodeData *data)
 {
     QSGSimpleTextureNode *node = static_cast<QSGSimpleTextureNode *>(oldNode);
     if (window() == nullptr || width() <= 0 || height() <= 0)
@@ -680,6 +679,10 @@ QSGNode *MpvPlayer::updatePaintNode(
             node->setTexture(texture);
         }
     }
+    else
+    {
+        return MpvPlayerBase::updatePaintNode(node, data);
+    }
     node->setRect(boundingRect());
     return node;
 }