[PATCH] atomic: add *_dec_not_zero

[David Laight]

> Introduce an *_dec_not_zero operation.  Make this a special case of
> *_add_unless because batman-adv uses atomic_dec_not_zero in different
> places like re-broadcast queue or aggregation queue management. There
> are other non-final patches which may also want to use this macro.

Isn't there a place where a default definition of this can be
defined? Instead of adding it separately to every architecture.

	David