This implementation prints out the default device announcement message. Given device foo0 on bus bar0 where foo0 has the name "FooCard 1234" the following would be printed:
foo0: <FooCard 1234> on bar0
bus_generic_print_child itself calls two functions bus_print_child_header and bus_print_child_footer The former prints "foo0: <FooCard 1234>" and the latter "on bar0". These routines should be used if possible in your own code if bus_generic_print_child does not completely suit your needs.
The number of characters output.