Coverity 1393639, unused variable

416        /* Wait while the dirty level is going down. */

417        for (;;) {

418                __wt_sleep(0, 100 * WT_THOUSAND);

419

CID 1393639 (#1 of 1): Unused value (UNUSED_VALUE)

returned_value: Assigning value from __wt_clock(session) to time_stop here, but that stored value is overwritten before it can be used.

420                time_stop = __wt_clock(session);

421                bytes_written_total =

422                    cache->bytes_written - bytes_written_start;

423

424                prev_dirty = current_dirty;

425                current_dirty =

426                    (100.0 * __wt_cache_dirty_leaf_inuse(cache)) / cache_size;

427                if (current_dirty <= cache->eviction_checkpoint_target ||

428                    current_dirty >= prev_dirty)

429                        break;