make proxy_stream_close close target stream even on errors #4905
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When a
git_filter_apply_fn
callback returns a error while smudgingproxy_stream_close
ends up returning without closing the stream. This is turn makes
blob_content_to_file
crash as it asserts the stream being closed whether there are errors or not.
Closing the target stream on error fixes this problem, with the downside being that
error strings set by
proxy_stream->target->close()
will override ones set bygit_filter_apply_fn
callback.