[coverity] plugin-libuv: fix access to IO in destructor
[coverity] plugin-libuv: fix access to IO in destructor

Change-Id: I9e684680b5c99241fc8558dbe7e94088a7656663
Reviewed-on: http://review.couchbase.org/122358
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Sergey Avseyev <87f6d5e4fd3644c3c20800cde7fd3ad1569370b3@gmail.com>

couchbase/libcouchbase,couchbase/libcouchbase,kojiromike/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,kojiromike/libcouchbase,couchbase/libcouchbase,kojiromike/libcouchbase,kojiromike/libcouchbase