osd: Remove extra call to release_op_ctx_locks in eval_repop. It is
called in remove_repop.

Signed-off-by: Zhiqiang Wang <wonzhq@hotmail.com>
Merge pull request #2336 from wonzhq/release-op-ctx-lock

osd: Remove extra call to release_op_ctx_locks in eval_repop

Reviewed-by: Samuel Just <sam.just@inktank.com>