server: cast sockaddr_in for accept()

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/server.c b/server.c
index 8fe7dac..011f355 100644
--- a/server.c
+++ b/server.c
@@ -429,7 +429,7 @@
 	if (exit_backend)
 		goto out;
 
-	sk = accept(listen_sk, &addr, &len);
+	sk = accept(listen_sk, (struct sockaddr *) &addr, &len);
 	if (sk < 0) {
 		log_err("fio: accept: %s\n", strerror(errno));
 		return -1;