[gnome-color-manager] trivial: fix up a warning when we unref GcmImage

[Richard Hughes <rhughes src gnome org>]

commit e3bc89763212be84743e53d256caf23495b5d3c3
Author: Richard Hughes <richard hughsie com>
Date:   Fri Jan 1 11:10:46 2010 +0000

    trivial: fix up a warning when we unref GcmImage

 src/gcm-image.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/src/gcm-image.c b/src/gcm-image.c
index 2ccb7bd..7a46905 100644
--- a/src/gcm-image.c
+++ b/src/gcm-image.c
@@ -253,6 +253,8 @@ gcm_image_notify_pixbuf_cb (GObject *object, GParamSpec *pspec, GcmImage *image)
 
 	/* check */
 	pixbuf = gtk_image_get_pixbuf (GTK_IMAGE(image));
+	if (pixbuf == NULL)
+		goto out;
 	applied = g_object_get_data (G_OBJECT(pixbuf), "cms-converted-pixbuf");
 	if (applied != NULL) {
 		egg_debug ("already copied and converted pixbuf, use gcm_image_cms_convert_pixbuf() instead");
@@ -272,6 +274,7 @@ gcm_image_notify_pixbuf_cb (GObject *object, GParamSpec *pspec, GcmImage *image)
 		g_object_set_data (G_OBJECT(pixbuf), "cms-converted-pixbuf", (gpointer)"true");
 	}
 out:
+	/* we do not own the pixbuf */
 	return;
 }