Add missing exit status on I/O errors

Author: wilsonzlin

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## Pending
 
 - Bump Java version for GitHub Actions.
+- [CLI] Add missing exit status on I/O errors.
 - [Internal] Loosen ahash dependency version.
 - [Internal] Bump lightningcss.
 

minhtml/src/main.rs

@@ -98,7 +98,7 @@ macro_rules! io_expect {
       Ok(r) => r,
       Err(e) => {
         eprintln!("[{}] {}: {}", $name, $msg, e);
-        return;
+        exit(1);
       }
     }
   };