MINOR: init: Fix the prototype for per-thread free callbacks

Functions registered to release memory per-thread have no return value. But the
registering function and the function pointer in per_thread_free_fct structure
specify it should return an integer. This patch fixes it.

This patch may be backported as far as 2.0.

(cherry picked from commit 83fefbcdff9f562d719fcb5da6b4a11e20e13c7c)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
2 files changed