mnl: initialize generic netlink version

The version field in mnlu was being passed in but never set.
This meant that all places mnlu_gen_socket was used, the version would
be uninitialized data from malloc().

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>

lib/mnl_utils.c

@@ -193,6 +193,8 @@ int mnlu_gen_socket_open(struct mnlu_gen_socket *nlg, const char *family_name,
 	if (!nlg->nl)
 		goto err_socket_open;
 
+	nlg->version = version;
+
 	err = family_get(nlg, family_name);
 	if (err)
 		goto err_socket;