Fix tests

Author: barun511

tests/ui/crashes/ice-12491.fixed

@@ -3,6 +3,6 @@
 fn main() {
     if (true) {
         // anything一些中文
-        //~^^ needless_return
+        //~^ needless_return
     }
 }

tests/ui/crashes/ice-12491.rs

@@ -4,6 +4,6 @@ fn main() {
     if (true) {
         // anything一些中文
         return;
-        //~^^ needless_return
+        //~^ needless_return
     }
 }

tests/ui/crashes/ice-12491.stderr

@@ -1,10 +1,8 @@
 error: unneeded `return` statement
-  --> tests/ui/crashes/ice-12491.rs:5:24
+  --> tests/ui/crashes/ice-12491.rs:6:9
    |
-LL |           // anything一些中文
-   |  ____________________________^
-LL | |         return;
-   | |______________^
+LL |         return;
+   |         ^^^^^^
    |
    = note: `-D clippy::needless-return` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(clippy::needless_return)]`