BUG/MINOR: sink: missing sft free in sink_deinit()

Adding missing free for sft (string_forward_target) in sink_deinit(),
which resulted in minor leak for each declared ring target at deinit().
(either explicit and implicit rings are affected)

This may be backported up to 2.4.

(cherry picked from commit a5754219e7ec7c0d2d46a5b502791a13457bd2f4)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
1 file changed