tc: netem: fix r parameter in Bernoulli loss model

tc: netem: fix r parameter in Bernoulli loss model

As the man page for tc netem states:

    To use the Bernoulli model, the only needed parameter is p while the
    others will be set to the default values r=1-p, 1-h=1 and 1-k=0.

However r parameter is erroneusly set to 1, and not to 1-p.
Fix this using the same approach of the 4-state loss model.

Fixes: 3c7950af598be ("netem: add support for 4 state and GE loss model")
Signed-off-by: Andrea Claudi <aclaudi@redhat.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>