🔧 fix compiler warning
🔧 fix compiler warning

Change-Id: I848439f9d444cc323175950fcae22cbba2cb4718
Reviewed-on: http://review.couchbase.org/c/couchbase-ruby-client/+/129171
Tested-by: Sergey Avseyev <87f6d5e4fd3644c3c20800cde7fd3ad1569370b3@gmail.com>
Reviewed-by: Sergey Avseyev <87f6d5e4fd3644c3c20800cde7fd3ad1569370b3@gmail.com>

couchbase/couchbase-ruby-client,couchbase/couchbase-ruby-client,couchbase/couchbase-ruby-client