server: fix wrong error return on host lookup failure

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/server.c b/server.c
index 9b13df8..9bfae79 100644
--- a/server.c
+++ b/server.c
@@ -1414,7 +1414,7 @@
 		if (ret) {
 			log_err("fio: failed to resolve <%s> (%s)\n", host,
 					gai_strerror(ret));
-			return 0;
+			return 1;
 		}
 
 		if (*ipv6)