[TIMOB-16102] iOS: AudioPlayer progress event not firing

[JIRA](https://jira.appcelerator.org/browse/TIMOB-16102)

iphone/Classes/TiMediaAudioPlayerProxy.h

@@ -17,7 +17,6 @@
 	double volume;
     double duration;
 	AudioStreamer *player;
-	BOOL progress;
 	NSTimer *timer;
 }
 

iphone/Classes/TiMediaAudioPlayerProxy.m

@@ -50,15 +50,19 @@ -(void)_listenerAdded:(NSString *)type count:(int)count
 {
 	if (count == 1 && [type isEqualToString:@"progress"])
 	{
-		progress = YES;
+		timer = [[NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(updateProgress:) userInfo:nil repeats:YES] retain];
 	}
 }
 
 -(void)_listenerRemoved:(NSString *)type count:(int)count
 {
 	if (count == 0 && [type isEqualToString:@"progress"])
 	{
-		progress = NO;
+        if (timer!=nil)
+        {
+            [timer invalidate];
+            RELEASE_TO_NIL(timer);
+        }
 	}
 }
 
@@ -72,15 +76,8 @@ -(AudioStreamer*)player
 		}
 		player = [[AudioStreamer alloc] initWithURL:url];
 		[player setDelegate:self];
-        [player setBufferSize:bufferSize];
+		[player setBufferSize:bufferSize];
 		[player setVolume:volume];
-
-		if (progress)
-		{
-			// create progress callback timer that fires once per second. we might want to eventually make this
-			// more configurable but for now that's sufficient for most apps that want to display progress updates on the stream
-			timer = [[NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(updateProgress:) userInfo:nil repeats:YES] retain];
-		}
 	}
 	return player;
 }