updated debug logging

lib/reader.js

@@ -43,6 +43,7 @@ function once(fn) {
     var call = !called;
     called = true;
     if(call) fn.apply(this, arguments);
+    else debug('once only callback failed');
   };
 }
 
@@ -273,11 +274,12 @@ function HlsStreamReader(src, options) {
     if (!stream) return;
 
     if (typeof stream.destroy == 'function') {
-      debug('timed out waiting for data');
       var duration = self.readState.currentSegment.duration || self.index.target_duration || 10;
       self.readState.timer = setTimeout(function() {
-        if (self.readState.stream)
+        if (self.readState.stream) {
+          debug('timed out waiting for data');
           self.readState.stream.destroy();
+        }
         self.readState.timer = null;
       }, 1.5*duration*1000);
     }