Fix build break in HashTable::findForWrite()
Fix build break in HashTable::findForWrite()

The previous commit (dddbb64cb) used a method which was removed in a
slightly earlier patch (c1605e164).

Fix by using the replacement API (findForWrite).

Change-Id: I0dfc9a2e34c66a4550dd8ad164afcb38348f2443
Reviewed-on: http://review.couchbase.org/109361
Reviewed-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@couchbase.com>
Tested-by: Dave Rigby <a09264da4832c7ff1d3bf1608a19f4b870f93750@couchbase.com>

daverigby/kv_engine,daverigby/kv_engine,daverigby/kv_engine,daverigby/kv_engine