demux: dash: const correctness

modules/demux/dash/xml/Node.cpp

@@ -62,7 +62,7 @@ void                                Node::setName               (const std::stri
     this->name = name;
 }
 
-bool                                Node::hasAttribute        (const std::string& name)
+bool                                Node::hasAttribute        (const std::string& name) const
 {
     if(this->attributes.find(name) != this->attributes.end())
         return true;

modules/demux/dash/xml/Node.h

@@ -44,7 +44,7 @@ namespace dash
                 void                                addSubNode          (Node *node);
                 const std::string&                  getName             () const;
                 void                                setName             (const std::string& name);
-                bool                                hasAttribute        (const std::string& name);
+                bool                                hasAttribute        (const std::string& name) const;
                 void                                addAttribute        (const std::string& key, const std::string& value);
                 const std::string&                  getAttributeValue   (const std::string& key) const;
                 std::vector<std::string>            getAttributeKeys    () const;