ole32: Remove a couple of interface casts.

dlls/ole32/compobj.c

@@ -4952,8 +4952,8 @@ HRESULT WINAPI CoGetObjectContext(REFIID riid, void **ppv)
     else
         context->apttype = APTTYPE_STA;
 
-    hr = IUnknown_QueryInterface((IUnknown *)&context->IComThreadingInfo_iface, riid, ppv);
-    IUnknown_Release((IUnknown *)&context->IComThreadingInfo_iface);
+    hr = IComThreadingInfo_QueryInterface(&context->IComThreadingInfo_iface, riid, ppv);
+    IComThreadingInfo_Release(&context->IComThreadingInfo_iface);
 
     return hr;
 }

dlls/ole32/defaulthandler.c

@@ -2185,7 +2185,7 @@ HRESULT HandlerCF_Create(REFCLSID rclsid, REFIID riid, LPVOID *ppv)
     This->refs = 0;
     This->clsid = *rclsid;
 
-    hr = IUnknown_QueryInterface((IUnknown *)&This->IClassFactory_iface, riid, ppv);
+    hr = IClassFactory_QueryInterface(&This->IClassFactory_iface, riid, ppv);
     if (FAILED(hr))
         HeapFree(GetProcessHeap(), 0, This);