Fix off by one error for delay_span_bug
Fix off by one error for delay_span_bug

delay_span_bug bumps error_count after checking treat_err_as_bug

graydon/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust