Free object on IOPS Creation failure

Change-Id: I4084e4e00cb8e4bcc6a9b14b15dcb26e7bf89a57
Reviewed-on: http://review.couchbase.org/28193
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>