1b5438ec2a
Since commit c8e8b5a6e, this has been zeroed out using the wrong length. In practice the length would always be too small, leading to not zeroing the whole buffer rather than clobbering additional memory; and that's pretty harmless, both because shmem would likely start out as zeroes and because we'd reinitialize any given entry before use. Still, it's bogus, so fix it. Reported by Petru-Florin Mihancea (bug #15312) Discussion: https://postgr.es/m/153363913073.1303.6518849192351268091@wrigleys.postgresql.org
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