[gnome-color-manager] trivial: fix up a crash reported by clang

[Richard Hughes <rhughes src gnome org>]

commit 3f9e3dfa1f6c325f1af293156a36cc0443a17c0d
Author: Richard Hughes <richard hughsie com>
Date:   Fri Feb 12 14:19:51 2010 +0000

    trivial: fix up a crash reported by clang

 src/gcm-prefs.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/src/gcm-prefs.c b/src/gcm-prefs.c
index c990b5e..93fab89 100644
--- a/src/gcm-prefs.c
+++ b/src/gcm-prefs.c
@@ -1540,10 +1540,10 @@ static void
 gcm_prefs_add_device_xrandr (GcmDevice *device)
 {
 	GtkTreeIter iter;
-	gchar *title_tmp;
-	gchar *title;
+	gchar *title_tmp = NULL;
+	gchar *title = NULL;
 	gchar *sort = NULL;
-	gchar *id;
+	gchar *id = NULL;
 	gboolean ret;
 	gboolean connected;
 	GError *error = NULL;