Fix crash during display layer reinitialization

Limelight/Stream/VideoDecoderRenderer.m

@@ -311,13 +311,9 @@ int DrSubmitDecodeUnit(PDECODE_UNIT decodeUnit);
     if (displayLayer.status == AVQueuedSampleBufferRenderingStatusFailed) {
         Log(LOG_E, @"Display layer rendering failed: %@", displayLayer.error);
         
-        // Recreate the display layer on the main thread.
-        // We need to use dispatch_sync() or we may miss
-        // some parameter sets while the layer is being
-        // recreated.
-        dispatch_sync(dispatch_get_main_queue(), ^{
-            [self reinitializeDisplayLayer];
-        });
+        // Recreate the display layer. We are already on the main thread,
+        // so this is safe to do right here.
+        [self reinitializeDisplayLayer];
         
         // Request an IDR frame to initialize the new decoder
         free(data);