fix uninitialized member (coverity)

git-svn-id: http://root.cern.ch/svn/root/trunk@31746 27541ba8-7e3a-0410-8455-c3a389f83636

io/io/src/TCollectionProxyFactory.cxx

@@ -146,7 +146,7 @@ TCollectionStreamer::TCollectionStreamer() : fStreamer(0)
    // Initializing constructor.
 }
 
-TCollectionStreamer::TCollectionStreamer(const TCollectionStreamer& c)
+TCollectionStreamer::TCollectionStreamer(const TCollectionStreamer& c) : fStreamer(0)
 {
    // Copy constructor.
    if ( c.fStreamer )  {