osd: zeroize ceph_osd_op instance in PrimaryLogPG::do_manifest_flush().

[rzarzynski]

Fixes: https://tracker.ceph.com/issues/45661
Signed-off-by: Radoslaw Zarzynski rzarzyns@redhat.com

Checklist

• References tracker ticket
• Updates documentation if necessary
• Includes tests for new functionality or reproducer for bug

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[rzarzynski]

http://pulpito.ceph.com/rzarzynski_bug45661/5116784/, although failed, hasn't shown any Valgrind issues.

[tchaikov]

drop this change as #35186 replaced the changed code block with

      {
	bufferlist t;
	cls_cas_chunk_create_or_get_ref_op get_call;
	get_call.source = soid;
	get_call.data = chunk_data;
	::encode(get_call, t);
	obj_op.call("cas", "chunk_create_or_get_ref", t);
      }

[tchaikov]

@rzarzynski shall we just close this PR? as #35186 has been merged.

[rzarzynski]

@tchaikov: yup. I will put a note into the tracker.