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	hooks: use hook to implement the callbacks
This way we get the version check implemented and save some code.
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					 26 changed files with 121 additions and 111 deletions
				
			
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			@ -72,8 +72,7 @@ struct node {
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	struct spa_param_info params[5];
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	struct spa_hook_list hooks;
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	const struct spa_node_callbacks *callbacks;
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	void *callbacks_data;
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	struct spa_hook callbacks;
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};
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struct impl {
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			@ -378,8 +377,7 @@ impl_node_set_callbacks(struct spa_node *node,
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	this = SPA_CONTAINER_OF(node, struct node, node);
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	this->callbacks = callbacks;
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	this->callbacks_data = data;
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	this->callbacks = SPA_HOOK_INIT(callbacks, data);
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	return 0;
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}
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			@ -1234,7 +1232,7 @@ static int node_ready(void *data, int status)
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	impl_node_process(&impl->node.node);
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	impl->driver = true;
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	return impl->node.callbacks->ready(impl->node.callbacks_data, status);
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	return spa_node_call_ready(&impl->node.callbacks, status);
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}
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static const struct spa_node_callbacks node_callbacks = {
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