[zenity] Reset errors after freeing them

[Matthias Clasen <matthiasc src gnome org>]

commit 55df95a2f737ae89bab9fe82c5e2a9e620761f05
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Jan 25 18:49:01 2011 -0500

    Reset errors after freeing them
    
    This was causing segfaults:
    https://bugzilla.redhat.com/show_bug.cgi?id=670895

 src/notification.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/notification.c b/src/notification.c
index 6fe44f1..41d64e2 100644
--- a/src/notification.c
+++ b/src/notification.c
@@ -133,6 +133,7 @@ zenity_notification_handle_stdin (GIOChannel *channel,
           if (error) {
             g_warning ("Error showing notification: %s", error->message);
             g_error_free (error);
+            error = NULL;
           }
 
 	  g_object_unref (notif);
@@ -150,6 +151,7 @@ zenity_notification_handle_stdin (GIOChannel *channel,
           if (error) {
             g_warning ("Error showing notification: %s", error->message);
             g_error_free (error);
+            error = NULL;
           }
         }
       } else if (!g_ascii_strcasecmp (command, "visible")) {