Address compiler warning in ExecutorPool::_getTaskQueue
Address compiler warning in ExecutorPool::_getTaskQueue

Addresses a comparison between an enum type and size_t

Change-Id: I33ee2aa578e08cd70609f8936d1fc867fa667336
Reviewed-on: http://review.couchbase.org/55985
Reviewed-by: Chiyoung Seo <fcffc23db27b19ee4ebba46695ee6b50e09216a2@couchbase.com>
Tested-by: Chiyoung Seo <fcffc23db27b19ee4ebba46695ee6b50e09216a2@couchbase.com>

daverigby/ep-engine,membase/ep-engine,teligent-ru/ep-engine,hisundar/ep-engine,hisundar/ep-engine,membase/ep-engine,owendCB/ep-engine,owendCB/ep-engine,daverigby/ep-engine,daverigby/kv_engine,teligent-ru/ep-engine,couchbase/ep-engine,daverigby/kv_engine,daverigby/kv_engine,couchbase/ep-engine,membase/ep-engine,daverigby/ep-engine,hisundar/ep-engine,daverigby/ep-engine,teligent-ru/ep-engine,owendCB/ep-engine,couchbase/ep-engine,hisundar/ep-engine,daverigby/kv_engine,owendCB/ep-engine,membase/ep-engine,couchbase/ep-engine,teligent-ru/ep-engine