Warning fixes.

http.c

@@ -132,7 +132,7 @@ http_response_write(struct http_response *r, int fd) {
 	}
 
 	ret = write(fd, s, sz);
-	if(!keep_alive && ret == sz) {
+	if(!keep_alive && (size_t)ret == sz) {
 		/* printf("response write, close fd=%d\n", fd); */
 		close(fd);
 	}

worker.c

@@ -16,11 +16,13 @@
 struct worker *
 worker_new(struct server *s) {
 
+	int ret;
 	struct worker *w = calloc(1, sizeof(struct worker));
 	w->s = s;
 
 	/* setup communication link */
-	pipe(w->link);
+	ret = pipe(w->link);
+	(void)ret;
 
 	/* Redis connection pool */
 	w->pool = pool_new(w, 8);	/* FIXME: change the number? use conf? */