Fix for compile error on recent clang.

Samples/multimedia/directshow/baseclasses/wxdebug.cpp

Index: Samples/multimedia/directshow/baseclasses/wxdebug.cpp
diff --git a/Samples/multimedia/directshow/baseclasses/wxdebug.cpp b/Samples/multimedia/directshow/baseclasses/wxdebug.cpp
index 57638912f452ed27c296f625b3295a2fe6d16320..6efa736987f2b68c074a5b2684bb6ae5f26e7c35 100644
--- a/Samples/multimedia/directshow/baseclasses/wxdebug.cpp
+++ b/Samples/multimedia/directshow/baseclasses/wxdebug.cpp
@@ -1234,7 +1234,7 @@ CDisp::CDisp(IUnknown *pUnk)
     hr = pUnk->QueryInterface(IID_IPin, (void **)&pp);
     if(SUCCEEDED(hr))
     {
-        CDisp::CDisp(static_cast<IPin*>(pp));
+        CDisp dummy(static_cast<IPin*>(pp));
         pp->Release();
         return;
     }