handle write error [CI SKIP]

src/main.rs

@@ -52,7 +52,7 @@ fn main() -> Result<(), Box<Error>> {
     };
     
     let mut out: Box<Write> = if let Some(path) = opt.output {
-        let mut file = File::open(&path)?;
+        let file = File::open(&path)?;
         Box::new(file)
     } else {
         Box::new(stdout())
@@ -82,7 +82,7 @@ fn main() -> Result<(), Box<Error>> {
         // Let's get the actual text in this text node. A text node wraps around
         // a RefCell<String>, so we need to call borrow() to get a &str out.
         //let text = text_node.as_text().unwrap().borrow();
-        write!(out, "{}", serialize_node(as_node)?);
+        write!(out, "{}", serialize_node(as_node)?)?;
         /*if let Some(child) = as_node.first_child() {
 
             //TODO: Convert Nodes to String, as this only works for Nodes containing plain text