[BP] MB-20598: AddressSanitizer problem in memcached
[BP] MB-20598: AddressSanitizer problem in memcached

There's a out of bound access problem in configuring ewouldblock engine.
First memcpy size is incorrect.

Change-Id: I43fcb1d923240826143a47241890965cdc335fc7
Reviewed-on: http://review.couchbase.org/68110
Reviewed-by: Dave Rigby <a09264da4832c7ff1d3bf1608a19f4b870f93750@couchbase.com>
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>

daverigby/kv_engine,couchbase/memcached,couchbase/memcached,daverigby/kv_engine,daverigby/memcached,daverigby/memcached,daverigby/kv_engine,couchbase/memcached,couchbase/memcached,daverigby/memcached,daverigby/kv_engine,daverigby/memcached