fix fmt diff

Author: richard-uk1

compiler/rustc_lexer/src/lib.rs

@@ -644,9 +644,7 @@ impl Cursor<'_> {
                 '.' | 'e' | 'E' => {}
 
                 // Just a 0.
-                _ => {
-                    return (Int { base, empty_int: false }, None);
-                }
+                _ => return (Int { base, empty_int: false }, None),
             }
         } else {
             // No base prefix, parse number in the usual way.