bonding: fix device name allocation error

	The code to select names for the bonding interfaces was, for the
non-sysfs creation case, always using a hard-coded set of bond0, bond1,
etc, up to max_bonds.  This caused conflicts for the second or
subsequent loads of the module.

	Changed the code to obtain device names from dev_alloc_name().

Signed-off-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>