This little function is expecting to receive data via stdin. If there is any data it exits with a error code of 1. If stdin is empty, then it exists with an error code of 0 (ie. no error). This is useful when using CI and things like gofmt.

Example: If there is any content in the gofmt command (ie. there is a formatting error), then stdinerror returns a error response (exit(1)).

gofmt -l folder | ./stdinerror