This is a very small an update to Documentation/i2c/writing-clients. The
changes are about i2c client driver ID. It used to say that chip driver
writers should ask for a unique ID. It now explains that such an ID is
not required and they can go without it. Until we get plain rid of it...

The patch additionally features CodingStyle updates. We can't ask people
to respect it and at the same time ignore it in our own docs.

I have made a similar change to the i2c (the project) documentation, and
will propose an update to Marcelo for Linux 2.4 (not sure he will accept
it though).
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>