refactor logger flushing

Author: mahdifrmz

crates/rust-analyzer/src/bin/logger.rs

@@ -4,7 +4,7 @@
 
 use std::{
     fs::File,
-    io::{self, BufWriter, Write},
+    io::{BufWriter, Write},
 };
 
 use env_logger::filter::{Builder, Filter};
@@ -75,13 +75,6 @@ impl Log for Logger {
     }
 
     fn flush(&self) {
-        match &self.file {
-            Some(w) => {
-                let _ = w.lock().flush();
-            }
-            None => {
-                let _ = io::stderr().flush();
-            }
-        }
+        self.file.as_ref().unwrap().lock().flush().unwrap();
     }
 }