[totem] browser-plugin: Fix possible run-time warning

[Bastien Nocera <hadess src gnome org>]

commit 6177d7d02d545fade8e0aa6ed81e2efa7999c837
Author: Bastien Nocera <hadess hadess net>
Date:   Sun Dec 4 11:13:03 2011 +0100

    browser-plugin: Fix possible run-time warning
    
    When starting up the viewer fails.

 browser-plugin/totemPlugin.cpp |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/browser-plugin/totemPlugin.cpp b/browser-plugin/totemPlugin.cpp
index f2c6adf..265e40c 100644
--- a/browser-plugin/totemPlugin.cpp
+++ b/browser-plugin/totemPlugin.cpp
@@ -691,7 +691,10 @@ totemPlugin::ViewerCleanup ()
         g_free (mViewerServiceName);
         mViewerServiceName = NULL;
 
-        g_bus_unwatch_name (mBusWatchId);
+	if (mBusWatchId) {
+		g_bus_unwatch_name (mBusWatchId);
+		mBusWatchId = 0;
+	}
 
 	if (mCancellable) {
 		g_cancellable_cancel (mCancellable);