programmer_delay: filter 0 usec delays

We use 0 as delay value for some chips. Just skipping these here is the
most elegant, maintainable solution.

Corresponding to flashrom svn r1760.

Signed-off-by: Urja Rannikko <urjaman@gmail.com>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
1 file changed