* *f and *hook_data are NULL if no hook exists at that position. */
void lttv_hooks_get(LttvHooks *h, unsigned i, LttvHook *f, void **hook_data,
* *f and *hook_data are NULL if no hook exists at that position. */
void lttv_hooks_get(LttvHooks *h, unsigned i, LttvHook *f, void **hook_data,