MB-11307 Initialize inflated_length
MB-11307 Initialize inflated_length

Clang static analyser complains that inflaged_length can be used
before it's initialized. I've checked the code and I believe it is
safe, and this isn't possible. However there's no harm in initializing
inflated_length, which has the benefit of squelching the warning.

Change-Id: Ibfb533dc32f6bee4948c40afba8505e1edd108bf
Reviewed-on: http://review.couchbase.org/37837
Reviewed-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>
Tested-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>

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