Fix eDO -Wunused-but-set-variable by using equivalent approach in related code.
In EDOHostService, the extra __block varaible is not needed since dispatch_sync doesn't change thread. In EDOChannelUtil, the frame data can be fetched through the additional usage on the returned data object so it's no longer unused.
Fix eDO -Wunused-but-set-variable by using equivalent approach in related code.
In EDOHostService, the extra __block varaible is not needed since dispatch_sync doesn't change thread. In EDOChannelUtil, the frame data can be fetched through the additional usage on the returned data object so it's no longer unused.