[gnome-multi-writer] trivial: Fix up a couple of Werror=format problems

[Richard Hughes <rhughes src gnome org>]

commit 01f77d10a0e7bea9f93ce0e6ffa687c9dd134373
Author: Richard Hughes <richard hughsie com>
Date:   Tue Aug 16 18:08:05 2016 +0100

    trivial: Fix up a couple of Werror=format problems

 src/gmw-main.c  |    2 +-
 src/gmw-probe.c |    3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/src/gmw-main.c b/src/gmw-main.c
index 76c5cdb..7598e8e 100644
--- a/src/gmw-main.c
+++ b/src/gmw-main.c
@@ -1670,7 +1670,7 @@ gmw_udisks_object_add (GmwPrivate *priv, GDBusObject *dbus_object)
        g_mutex_lock (&priv->devices_mutex);
        g_ptr_array_add (priv->devices, device);
        g_mutex_unlock (&priv->devices_mutex);
-       g_debug ("Added %s [%lu]", block_path, device_size);
+       g_debug ("Added %s [%" G_GUINT64_FORMAT "]", block_path, device_size);
        return TRUE;
 }
 
diff --git a/src/gmw-probe.c b/src/gmw-probe.c
index b1b8890..aec89ab 100644
--- a/src/gmw-probe.c
+++ b/src/gmw-probe.c
@@ -374,7 +374,8 @@ gmw_probe_scan_device (GmwProbeDevice *dev, GCancellable *cancellable, GError **
                             dev->disk_size / ONE_GB);
                return FALSE;
        }
-       g_debug ("Disk reports to be %luMB in size", dev->disk_size / ONE_MB);
+       g_debug ("Disk reports to be %" G_GUINT64_FORMAT "MB in size",
+                dev->disk_size / ONE_MB);
 
        /* save data that's there already */
        if (!gmw_probe_device_data_save (dev, cancellable, error))