test: error when empty buffer is passed to fs.read()

Added tests to occur error when empty buffer is passed to fs.read()
to increase coverage.

PR-URL: https://github.com/nodejs/node/pull/23141


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>