A chained topology must always have an increment of 1.
Here, it was 2 if ports number is even.
Signed-off-by: Damien Millescamps <damien.millescamps@6wind.com>
Acked-by: Ivan Boule <ivan.boule@6wind.com>
Acked-by: Thomas Monjalon <thomas.monjalon@6wind.com>
c866aaa854