client/server: don't reset ipv6 expectations

fio_server_parse_host() no longer falls back to ipv4, so just
pass in the actual value, not a reference.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/client.c b/client.c
index 7975ce6..467d093 100644
--- a/client.c
+++ b/client.c
@@ -238,7 +238,7 @@
 		int ipv6;
 
 		ipv6 = type == Fio_client_ipv6;
-		if (fio_server_parse_host(hostname, &ipv6,
+		if (fio_server_parse_host(hostname, ipv6,
 						&client->addr.sin_addr,
 						&client->addr6.sin6_addr))
 			goto err;