pipewire: module-filter-chain: free `node::config`
Previously, the `node::config` string was not freed in `node_free()`
or elsewhere, leading to a memory leak if the node had a "config"
section in the configuration.
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Previously, the `node::config` string was not freed in `node_free()`
or elsewhere, leading to a memory leak if the node had a "config"
section in the configuration.