Don't free stack variables
Don't free stack variables

couch-kvstore.cc:1644:27: warning: attempt to free a non-heap object 'ext_meta' [-Wfree-nonheap-object]

Change-Id: Iff414c633af0976d8036ad58b42ee24a638f6387
Reviewed-on: http://review.couchbase.org/38235
Reviewed-by: Dave Rigby <a09264da4832c7ff1d3bf1608a19f4b870f93750@couchbase.com>
Tested-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>

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