The callback devlink_nl_cmd_health_reporter_diagnose_doit() miss
devlink_fmsg_free(), which leads to memory leak.

Fix it by adding devlink_fmsg_free().

Fixes: e994a75f ("devlink: remove reporter reference counting")
Signed-off-by: NMoshe Shemesh <moshe@nvidia.com>
Reviewed-by: NJiri Pirko <jiri@nvidia.com>
Reviewed-by: NSimon Horman <simon.horman@corigine.com>
Link: https://lore.kernel.org/r/1675698976-45993-1-git-send-email-moshe@nvidia.comSigned-off-by: NJakub Kicinski <kuba@kernel.org>