Fix tidy check.

Author: tvladyslav

src/test/compile-fail/E0221.rs

@@ -18,7 +18,7 @@ trait Foo {
 trait Bar : Foo {
     type A: T2;
     fn do_something() {
-        let _: Self::A; 
+        let _: Self::A;
         //~^ ERROR E0221
         //~| NOTE ambiguous associated type `A`
         //~| NOTE associated type `Self` could derive from `Foo`