[gnome-bluetooth] lib: Fix compile-time warning

[Bastien Nocera <hadess src gnome org>]

commit 86574feca8f33aa173cd9b0558c52d4fafb8320b
Author: Bastien Nocera <hadess hadess net>
Date:   Fri Feb 16 11:52:46 2018 +0100

    lib: Fix compile-time warning
    
    lib/bluetooth-client.c:1225:8: warning: assignment from incompatible pointer type 
[-Wincompatible-pointer-types]
      model = g_object_ref(priv->store);
            ^

 lib/bluetooth-client.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/lib/bluetooth-client.c b/lib/bluetooth-client.c
index beea7ed..0233537 100644
--- a/lib/bluetooth-client.c
+++ b/lib/bluetooth-client.c
@@ -1210,7 +1210,7 @@ GtkTreeModel *bluetooth_client_get_model (BluetoothClient *client)
        g_return_val_if_fail (BLUETOOTH_IS_CLIENT (client), NULL);
 
        priv = BLUETOOTH_CLIENT_GET_PRIVATE(client);
-       model = g_object_ref(priv->store);
+       model = GTK_TREE_MODEL (g_object_ref(priv->store));
 
        return model;
 }