[glibmm] IOChannel: move operations: Call the base sigc::trackable.

[Murray Cumming <murrayc src gnome org>]

commit 935d0561bb0fc11ac1e52f27d3d118ca30a6dc96
Author: Murray Cumming <murrayc murrayc com>
Date:   Tue Sep 1 16:54:03 2015 +0200

    IOChannel: move operations: Call the base sigc::trackable.

 glib/src/iochannel.ccg |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/glib/src/iochannel.ccg b/glib/src/iochannel.ccg
index fd8df45..13319f1 100644
--- a/glib/src/iochannel.ccg
+++ b/glib/src/iochannel.ccg
@@ -128,13 +128,16 @@ IOChannel::IOChannel()
 }
 
 IOChannel::IOChannel(IOChannel&& other) noexcept
-: gobject_(std::move(other.gobject_))
+: sigc::trackable(std::move(other)),
+  gobject_(std::move(other.gobject_))
 {
   other.gobject_ = nullptr;
 }
 
 IOChannel& IOChannel::operator=(IOChannel&& other) noexcept
 {
+  sigc::trackable::operator=(std::move(other));
+
   release_gobject();
 
   gobject_ = std::move(other.gobject_);