[vala/staging] avahi-client: Fix "use of possibly unassigned parameter" warnings

[Rico Tzschichholz <ricotz src gnome org>]

commit 1265b39e6c07f2fd561ed183538245a0a368db70
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Sat Oct 5 10:34:52 2019 +0200

    avahi-client: Fix "use of possibly unassigned parameter" warnings

 vapi/avahi-client.vapi | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/vapi/avahi-client.vapi b/vapi/avahi-client.vapi
index 97bdbecdd..2e3b0ad1d 100644
--- a/vapi/avahi-client.vapi
+++ b/vapi/avahi-client.vapi
@@ -177,6 +177,10 @@ namespace Avahi {
                                name = (string) name_data;
                                type = (string) type_data;
                                domain = (string) domain_data;
+                       } else {
+                               name = null;
+                               type = null;
+                               domain = null;
                        }
 
                        return errno;