[cheese] Fix signed comparison warning in camera service

[David King <davidk src gnome org>]

commit 908bf2b81d2686e6dc2fcfe7e9d584f931025e6a
Author: David King <amigadave amigadave com>
Date:   Thu Jan 29 10:11:48 2015 +0000

    Fix signed comparison warning in camera service

 service/gc-camera-client.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/service/gc-camera-client.c b/service/gc-camera-client.c
index 18278a2..444354d 100644
--- a/service/gc-camera-client.c
+++ b/service/gc-camera-client.c
@@ -66,7 +66,7 @@ gc_camera_client_set_image_data_from_pixbuf (GcCameraClient *self,
     }
 
     g_free (priv->image_data);
-    priv->image_data = g_base64_encode (buffer, length);
+    priv->image_data = g_base64_encode ((const guchar *)buffer, length);
     g_free (buffer);
 
     g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_IMAGE_DATA]);