Initialized member priority in CallbackInfo constructor.

RtAudio.h

@@ -616,7 +616,7 @@ struct CallbackInfo {
 
   // Default constructor.
   CallbackInfo()
-  :object(0), callback(0), userData(0), errorCallback(0), apiInfo(0), isRunning(false), doRealtime(false) {}
+  :object(0), callback(0), userData(0), errorCallback(0), apiInfo(0), isRunning(false), doRealtime(false), priority(0) {}
 };
 
 // **************************************************************** //