lib, zebra: fix exit from link-params node

When exiting from link-params node, we must not decrement xpath_index
because it is not incremented when entering the node.

Signed-off-by: Igor Ryzhov <iryzhov@nfware.com>

lib/command.c

@@ -160,6 +160,9 @@ static bool vty_check_node_for_xpath_decrement(enum node_type target_node,
 		|| node == BGP_FLOWSPECV6_NODE))
 		return false;
 
+	if (target_node == INTERFACE_NODE && node == LINK_PARAMS_NODE)
+		return false;
+
 	return true;
 }