BUG/MINOR: logs: fix log-steps extra log origins selection

BUG/MINOR: logs: fix log-steps extra log origins selection

Willy noticed that it was not possible to select extra log origins using
log-steps directive. Extra origins are the one registered using
log_orig_register() such as http-req.

Reason was the error path was always executed during extra log origin
matching for log-steps parser, while it should only be executed if no
match was found.

It should be backported to 3.1.

(cherry picked from commit 563b4fafc26f20ff0e799811f7cea7dca01f2c9e)
Signed-off-by: Amaury Denoyelle <adenoyelle@haproxy.com>
(cherry picked from commit 54dee5bb5da5e23496dbd5ae86807a31a07bd7a6)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>