[gtk-vnc] Don't leak server object in tests

[Daniel P. Berrange <dberrange src gnome org>]

commit ef4e1d2371c36ea7fa45925e5331d077d320b676
Author: Daniel P. Berrangé <berrange redhat com>
Date:   Fri May 3 15:35:42 2019 +0100

    Don't leak server object in tests
    
    Signed-off-by: Daniel P. Berrangé <berrange redhat com>

 src/vncconnectiontest.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/vncconnectiontest.c b/src/vncconnectiontest.c
index fb12833..b2cbee1 100644
--- a/src/vncconnectiontest.c
+++ b/src/vncconnectiontest.c
@@ -153,6 +153,7 @@ static gpointer test_helper_server(gpointer opaque)
     }
 
     g_object_unref(client);
+    g_object_unref(server);
 
     return NULL;
 }