pulse-server: use `spa_autofree` with `open_memstream()`
Coverity is saying that `response_str` is leaked on the return
if `fclose()` returns non-zero. So use `spa_autofree` to fix that.
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Coverity is saying that `response_str` is leaked on the return
if `fclose()` returns non-zero. So use `spa_autofree` to fix that.