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doc: tutorial3: do not spa_zero()
the hook objects
`spa_hook_list_append()` zeroes the hooks when they are inserted into the list of hooks.
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@ -22,7 +22,6 @@ static int roundtrip(struct pw_core *core, struct pw_main_loop *loop)
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.done = core_event_done,
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};
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spa_zero(core_listener);
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pw_core_add_listener(core, &core_listener,
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&core_events, NULL);
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@ -70,7 +69,6 @@ int main(int argc, char *argv[])
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registry = pw_core_get_registry(core, PW_VERSION_REGISTRY,
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0 /* user_data size */);
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spa_zero(registry_listener);
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pw_registry_add_listener(registry, ®istry_listener,
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®istry_events, NULL);
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@ -16,7 +16,7 @@ Let's take a look at what this method does.
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\code{.c}
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struct spa_hook core_listener;
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spa_zero(core_listener);
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pw_core_add_listener(core, &core_listener,
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&core_events, NULL);
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\endcode
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