Remove unused field (reported by clion)
Remove unused field (reported by clion)

Change-Id: I4c032ad49c6ea3cc7d1ac65fd72bc86ef3e6a40e
Reviewed-on: http://review.couchbase.org/41137
Reviewed-by: Dave Rigby <a09264da4832c7ff1d3bf1608a19f4b870f93750@couchbase.com>
Tested-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>

mrkwse/memcached,daverigby/kv_engine,mrkwse/memcached,owendCB/memcached,mrkwse/memcached,mrkwse/memcached,owendCB/memcached,owendCB/memcached,couchbase/memcached,daverigby/kv_engine,cloudrain21/memcached-1,daverigby/memcached,daverigby/kv_engine,daverigby/memcached,daverigby/memcached,jimwwalker/memcached,daverigby/kv_engine,cloudrain21/memcached-1,jimwwalker/memcached,jimwwalker/memcached,couchbase/memcached,couchbase/memcached,cloudrain21/memcached-1,cloudrain21/memcached-1,owendCB/memcached,daverigby/memcached,couchbase/memcached