AFIamgeRequestOperation modification

gistfile1.m

static dispatch_queue_t af_image_request_operation_processing_queue;
static dispatch_queue_t image_request_operation_processing_queue() {
    if (af_image_request_operation_processing_queue == NULL) {
        af_image_request_operation_processing_queue = dispatch_queue_create("com.alamofire.networking.image-request.processing", 0);
        dispatch_set_target_queue(af_image_request_operation_processing_queue, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0));
    }
    
    return af_image_request_operation_processing_queue;
}