block: initialize integrity buffer to zero before writing it to media

Ming Leirequested to merge
minlei/centos-stream-9:rhel9.5-init_integrity_buf into main

JIRA: https://issues.redhat.com/browse/RHEL-54768 CVE: CVE-2024-43854

Signed-off-by: Ming Lei ming.lei@redhat.com

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