rgw: fix bug where variable referenced after data moved out

[ivancich]

Addresses RGWGetObj_ObjStore_S3::override_range_hdr using a variable
for logging after the data had been moved out. This was caught by
coverity.

Signed-off-by: J. Eric Ivancich ivancich@redhat.com

Fixes: https://tracker.ceph.com/issues/57328

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[ivancich]

Teuthology Run:

• https://pulpito.ceph.com/ivancich-2022-09-02_16:14:51-rgw-wip-eric-testing-2-distro-default-smithi/
• https://pulpito.ceph.com/ivancich-2022-09-02_16:15:15-rgw-wip-eric-testing-2-distro-default-smithi/

[ivancich]

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