minor fixes to main()

src/main.rs

@@ -472,12 +472,12 @@ fn main() -> Result<()> {
             if unsafe { libc::isatty(stdin) } == 0 {
                 unsafe { File::from_raw_fd(stdin) }
             } else {
-                File::open("/dev/null").unwrap()
+                File::open("/dev/null")?
             }
         }
         Some(path) => {
             let input_file = Path::new(path);
-            file_name = Some(OsString::from(input_file.clone().display().to_string()));
+            file_name = Some(OsString::from(&path));
 
             File::open(input_file).unwrap_or_else(|_| {
                 let mut err = String::new();
@@ -491,8 +491,7 @@ fn main() -> Result<()> {
             })
         }
     }
-    .read_to_end(&mut buf)
-    .unwrap();
+    .read_to_end(&mut buf)?;
 
     let text = String::from_utf8(buf).unwrap_or_else(|_| {
         eprintln!(