[gnome-color-manager] Fix up a missing return error where the output is disconnected

[Richard Hughes <rhughes src gnome org>]

commit 08adbfe15ca3092fd9aa41097a4e42b10a2aec9a
Author: Richard Hughes <richard hughsie com>
Date:   Wed Nov 4 15:20:15 2009 +0000

    Fix up a missing return error where the output is disconnected

 src/gcm-utils.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/src/gcm-utils.c b/src/gcm-utils.c
index 6737f1f..66ba105 100644
--- a/src/gcm-utils.c
+++ b/src/gcm-utils.c
@@ -223,8 +223,11 @@ gcm_utils_get_clut_for_output (GnomeRROutput *output, GError **error)
 
 	/* don't set the gamma if there is no device */
 	connected = gnome_rr_output_is_connected (output);
-	if (!connected)
+	if (!connected) {
+		if (error != NULL)
+			*error = g_error_new (1, 0, "cannot get clut for a unconnected output");
 		goto out;
+	}
 
 	/* get data */
 	name = gcm_utils_get_output_name (output);