flimflam: Enable -Wimplicit-function-declaration.

src/device.c

 /*
  *
  *  Connection Manager
  *
  *  Copyright (C) 2007-2009  Intel Corporation. All rights reserved.
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License version 2 as
  *  published by the Free Software Foundation.
  *
  *  This program is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *  GNU General Public License for more details.
  *
  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  *
  */
 
 #ifdef HAVE_CONFIG_H
 #include <config.h>
 #endif
 
 #include <errno.h>
+#include <stdlib.h>
 #include <string.h>
 
 #include <gdbus.h>
 
 #include <connman/assert.h>
 
 #include "connman.h"
 
 #define _DBG_DEVICE(fmt, arg...)        DBG(DBG_DEVICE, fmt, ## arg)
 
@@ skipping 2335 matching lines @@
                 connman_error("%s: failed to register storage", __func__);
         return connman_driver_register(&device_driver);
 }
 
 void __connman_device_cleanup(void)
 {
         connman_driver_unregister(&device_driver);
         connman_storage_unregister(&device_storage);
         dbus_connection_unref(connection);
 }