Fix bug 181823: make CheckSameOrigin always return a value, rather than garbage. r=heikki, sr=bzbarsky

content/base/src/nsDOMSerializer.cpp

@@ -189,6 +189,7 @@ nsresult CheckSameOrigin(nsIDOMNode *aRoot)
     }      
   }
 
+  return NS_OK;
 }
 
 NS_IMETHODIMP