Use Result::ok (#496)

* Use `Result::ok`

* Update uefi/src/main.rs

---------

Co-authored-by: Tom Dohrmann <[email protected]>

Author: ChocolateLoverRaj

uefi/src/main.rs

@@ -313,10 +313,7 @@ fn load_file_from_disk(
 
     let file_handle_result = root.open(filename, FileMode::Read, FileAttribute::empty());
 
-    let file_handle = match file_handle_result {
-        Err(_) => return None,
-        Ok(handle) => handle,
-    };
+    let file_handle = file_handle_result.ok()?;
 
     let mut file = match file_handle.into_type().unwrap() {
         uefi::proto::media::file::FileType::Regular(f) => f,