[gnome-control-center] printers: Fix compile-time warning

[Marek Kašík <mkasik src gnome org>]

commit 48ef91a0b911b503f8d5cf05c9016c47f72007d3
Author: Marek Kasik <mkasik redhat com>
Date:   Wed Jul 29 15:40:22 2015 +0200

    printers: Fix compile-time warning
    
    pp-new-printer-dialog.c:673:18: warning: 'device' may be used uninitialized
    in this function [-Wmaybe-uninitialized]

 panels/printers/pp-new-printer-dialog.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/panels/printers/pp-new-printer-dialog.c b/panels/printers/pp-new-printer-dialog.c
index 1917ea8..ed61104 100644
--- a/panels/printers/pp-new-printer-dialog.c
+++ b/panels/printers/pp-new-printer-dialog.c
@@ -662,6 +662,7 @@ group_physical_devices_cb (gchar    ***device_uris,
           /* Is there any device in this sublist? */
           if (device_uris[i][0] != NULL)
             {
+              device = NULL;
               for (j = 0; device_uris[i][j] != NULL; j++)
                 {
                   device = device_in_list (device_uris[i][j], priv->devices);