[ekiga] Fix crash at startup

[Eugen Dedu <ededu src gnome org>]

commit 263618b5034785cc9b7a3603ce1c35f45481b839
Author: Eugen Dedu <eugen dedu univ-fcomte fr>
Date:   Sat Feb 6 12:20:32 2016 +0100

    Fix crash at startup
    
    It occurs 80% of times on one of my two machines.  The bug was introduced
    by commit cdb594.

 plugins/avahi/avahi-heap.cpp |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/plugins/avahi/avahi-heap.cpp b/plugins/avahi/avahi-heap.cpp
index b5bc7ae..36d4ebc 100644
--- a/plugins/avahi/avahi-heap.cpp
+++ b/plugins/avahi/avahi-heap.cpp
@@ -109,6 +109,7 @@ Avahi::Heap::load ()
   /* let's make sure those are sanely initialized */
   poll = NULL;
   client = NULL;
+  resolver = NULL;
 
   avahi_set_allocator (avahi_glib_allocator ());
   poll = avahi_glib_poll_new (NULL, G_PRIORITY_DEFAULT);