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Send the correct amount of data to the next astreamer, not the whole allocated buffer size. This bug escaped detection because in present uses the next astreamer is always a tar-file parser which is insensitive to trailing garbage. But that may not be true in future uses. Author: Andrew Dunstan <andrew@dunslane.net> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/2178517.1774064942@sss.pgh.pa.us Backpatch-through: 15