Put pipecheck in the BufWriter, not the other way around

EPIPE can only happen on writes to the real stderr, so checking for
those failures on every _buffered_ write is silly.

This is also my justification for not cargo-culting `#[cold]` or other
silly "performance" attributes on pipecheck's termination functions.
This only matters when you're making a system call, at which point
you're doing something far more expensive than a branch misprediction
or whatever.

Author: featherbread

src/main.rs

@@ -59,7 +59,7 @@ fn main() {
 	}
 
 	let mut stdin_used = false;
-	let mut output = pipecheck::wrap(BufWriter::new(stdout.lock()));
+	let mut output = BufWriter::new(pipecheck::wrap(stdout.lock()));
 	let mut translator = xt::Translator::new(&mut output, args.to);
 
 	let input_paths = if args.input_pathnames.is_empty() {