[mutter] native: don't call steal_pointer prematurely

[Ray Strode <halfline src gnome org>]

commit d49106311031cfce2e874125625a5d7c373e807d
Author: Ray Strode <rstrode redhat com>
Date:   Wed Oct 19 14:27:24 2016 -0400

    native: don't call steal_pointer prematurely
    
    commit e2bfaf07514ed633f8721b5f521577685b6cccc0 does this:
    
    g_hash_table_insert (cards,
                         g_udev_device_get_name (parent_device),
                         g_steal_pointer (&parent_device));
    
    The problem is the g_steal_pointer call may happen before the
    g_udev_device_get_name call leading to a crash.
    
    This commit does the get_name call on an earlier line
    
    https://bugzilla.gnome.org/show_bug.cgi?id=771442

 src/backends/native/meta-launcher.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/src/backends/native/meta-launcher.c b/src/backends/native/meta-launcher.c
index a2885a1..ddb7080 100644
--- a/src/backends/native/meta-launcher.c
+++ b/src/backends/native/meta-launcher.c
@@ -297,6 +297,7 @@ count_devices_with_connectors (const gchar *seat_name,
       GUdevDevice *device = tmp->data;
       g_autoptr (GUdevDevice) parent_device = NULL;
       const gchar *parent_device_type = NULL;
+      const gchar *parent_device_name = NULL;
       const gchar *card_seat;
 
       /* filter out the real card devices, we only care about the connectors */
@@ -323,8 +324,9 @@ count_devices_with_connectors (const gchar *seat_name,
       if (g_strcmp0 (seat_name, card_seat) != 0)
         continue;
 
+      parent_device_name = g_udev_device_get_name (parent_device);
       g_hash_table_insert (cards,
-                           (gpointer) g_udev_device_get_name (parent_device),
+                           (gpointer) parent_device_name ,
                            g_steal_pointer (&parent_device));
     }