[BOND]: Fix bond_init() error path handling.

From: Florin Malita <fmalita@gmail.com>

bond_init() is not releasing rtnl_sem after register_netdevice() and before
calling unregister_netdevice() (from bond_free_all()) in the exception
path.  As the device registration is not completed (dev->reg_state ==
NETREG_REGISTERING), the call to unregister_netdevice() triggers
BUG_ON(dev->reg_state != NETREG_REGISTERED).

Signed-off-by: Florin Malita <fmalita@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/bonding/bond_main.c

@@ -5039,6 +5039,14 @@ static int __init bonding_init(void)
 	return 0;
 
 out_err:
+	/*
+	 * rtnl_unlock() will run netdev_run_todo(), putting the
+	 * thus-far-registered bonding devices into a state which
+	 * unregigister_netdevice() will accept
+	 */
+	rtnl_unlock();
+	rtnl_lock();
+
 	/* free and unregister all bonds that were successfully added */
 	bond_free_all();