refactor logger flushing

Author: mahdifrmz

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

@@ -50,16 +50,17 @@ impl Log for Logger {
 
         match &self.file {
             Some(w) => {
+                let mut writer = w.lock();
                 let _ = writeln!(
-                    w.lock(),
+                    writer,
                     "[{} {}] {}",
                     record.level(),
                     record.module_path().unwrap_or_default(),
                     record.args(),
                 );
 
                 if self.no_buffering {
-                    self.flush();
+                    writer.flush().unwrap();
                 }
             }
             None => {