rbd: use rbd_obj_watch_request_helper() helper
Switch rbd_dev_header_{un,}watch_sync() to use the new helper and fix rbd_dev_header_unwatch_sync() to destroy watch_request structures before queuing watch-remove message while at it. This mistake slipped into commit b30a01f2 ("rbd: fix osd_request memory leak in __rbd_dev_header_watch_sync()") and could lead to "image still in use" errors on image removal. Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com> Reviewed-by: Alex Elder <elder@linaro.org>
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