[gitg] Fix unsetting connected signal id on disconnect

[Jesse van den Kieboom <jessevdk src gnome org>]

commit 9b47855aefd5bb1487f80307af9ed09d19f5dde7
Author: Jesse van den Kieboom <jessevdk gnome org>
Date:   Thu Aug 13 20:03:20 2015 +0200

    Fix unsetting connected signal id on disconnect

 libgitg/gitg-when-mapped.vala |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/libgitg/gitg-when-mapped.vala b/libgitg/gitg-when-mapped.vala
index 5716df8..fbb7d69 100644
--- a/libgitg/gitg-when-mapped.vala
+++ b/libgitg/gitg-when-mapped.vala
@@ -87,6 +87,7 @@ namespace Gitg
                        if (d_sid != 0)
                        {
                                d_widget.disconnect(d_sid);
+                               d_sid = 0;
                        }
 
                        if (d_lifetime != null)