input/qobuz: pass std::string by value to OnQobuzTrackSuccess()

src/input/plugins/QobuzInputPlugin.cxx

@@ -76,7 +76,7 @@ private:
 	void OnQobuzSession() noexcept override;
 
 	/* virtual methods from QobuzTrackHandler */
-	void OnQobuzTrackSuccess(std::string &&url) noexcept override;
+	void OnQobuzTrackSuccess(std::string url) noexcept override;
 	void OnQobuzTrackError(std::exception_ptr error) noexcept override;
 };
 
@@ -100,7 +100,7 @@ QobuzInputStream::OnQobuzSession() noexcept
 }
 
 void
-QobuzInputStream::OnQobuzTrackSuccess(std::string &&url) noexcept
+QobuzInputStream::OnQobuzTrackSuccess(std::string url) noexcept
 {
 	const std::lock_guard<Mutex> protect(mutex);
 

src/input/plugins/QobuzTrackRequest.hxx

@@ -38,7 +38,7 @@ class QobuzTrackHandler
 	: public boost::intrusive::list_base_hook<boost::intrusive::link_mode<boost::intrusive::safe_link>>
 {
 public:
-	virtual void OnQobuzTrackSuccess(std::string &&url) noexcept = 0;
+	virtual void OnQobuzTrackSuccess(std::string url) noexcept = 0;
 	virtual void OnQobuzTrackError(std::exception_ptr error) noexcept = 0;
 };