SUNRPC: Rebalance a kref in auth_gss.c

Restore the kref_get that matches the gss_put_auth(gss_msg->auth)
done by gss_release_msg().

Fixes: ac83228 ("SUNRPC: Use namespace of listening daemon ...")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

net/sunrpc/auth_gss/auth_gss.c

@@ -551,6 +551,7 @@ gss_alloc_msg(struct gss_auth *gss_auth,
 	refcount_set(&gss_msg->count, 1);
 	gss_msg->uid = uid;
 	gss_msg->auth = gss_auth;
+	kref_get(&gss_auth->kref);
 	if (service_name) {
 		gss_msg->service_name = kstrdup_const(service_name, GFP_NOFS);
 		if (!gss_msg->service_name) {