Fix more warnings on linux

Source/core/rendering/RenderObject.cpp

Index: Source/core/rendering/RenderObject.cpp
diff --git a/Source/core/rendering/RenderObject.cpp b/Source/core/rendering/RenderObject.cpp
index b3ab3f2d729a1d58c2981c98fdd62d471d8c1b57..3d954cb794ed7849745b14f672c1601dfaa9d0a6 100644
--- a/Source/core/rendering/RenderObject.cpp
+++ b/Source/core/rendering/RenderObject.cpp
@@ -1379,7 +1379,7 @@ RenderLayerModelObject* RenderObject::containerForRepaint() const
     if (parentRenderFlowThread) {
         // The ancestor document will do the reparenting when the repaint propagates further up.
         // We're just a seamless child document, and we don't need to do the hacking.
-        if (&parentRenderFlowThread && parentRenderFlowThread->document() != document())
+        if (parentRenderFlowThread->document() != document())
             return repaintContainer;
         // If we have already found a repaint container then we will repaint into that container only if it is part of the same
         // flow thread. Otherwise we will need to catch the repaint call and send it to the flow thread.