Check the error condition testing for passing something other than a
string or buffer. Currently, there are no tests for this.
PR-URL: https://github.com/nodejs/node/pull/8350
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed By: James M Snell <jasnell@gmail.com>
Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>
