rgw : fix add initialization for RGWGC::process()

[BryceCao]

Fixes: https://tracker.ceph.com/issues/57323
Signed-off-by: caolei cao.leilc@inspur.com

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[yuvalif]

jenkins test make check

[github-actions]

This pull request can no longer be automatically merged: a rebase is needed and changes have to be manually resolved

[yuvalif]

jenkins test signed

[yuvalif]

@BryceCao not sure why the "signed by" check fails. maybe put your email in rectangular brackets?

[yuvalif]

jenkins test make check

[cbodley]

passed qa in https://pulpito.ceph.com/cbodley-2023-06-08_19:52:02-rgw-wip-cbodley-testing-distro-default-smithi/