daemon/config_parse.cc: Potential leak of memory pointed to by 'content_str'
daemon/config_parse.cc: Potential leak of memory pointed to by 'content_str'

Fix issue reported by Clang Static Analyzer:

    File:        memcached/daemon/config_parse.cc
    Location:    line 848, column 9
    Description: Potential leak of memory pointed to by 'content_str'

Change-Id: I37a418746396049be64b7e24a7bb1112e7ea402a
Reviewed-on: http://review.couchbase.org/57851
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>

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