BUG/MAJOR: spoa/python: Fixing return None

As per https://docs.python.org/3/c-api/none.html, None requires to be
incremented before being returned to prevent deallocating none

This patch must be backported as far as 2.0.

(cherry picked from commit d5c428e761796317fdfa9c7f9bf3f6280e218a98)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
1 file changed