Cleanup: Fix warning from -Wclass-memaccess
Cleanup: Fix warning from -Wclass-memaccess

There is no point of doing memset of the variable before using
it as we check the return value for the method which is supposed
to initialize the object.

Change-Id: I8df8c04ed6788a00d70ffe3533cd9046986fdb9e
Reviewed-on: http://review.couchbase.org/c/kv_engine/+/128608
Reviewed-by: Jim Walker <1cd02e31b43620d7c664e038ca42a060d61727b9@couchbase.com>
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>

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