gss-api: use __contents in test

Author: dishmaker

gss-api/src/negotiation.rs

@@ -383,13 +383,7 @@ mod tests {
         );
         assert_eq!(
             b"not_defined_in_RFC4178@please_ignore",
-            &neg_token
-                .neg_hints
-                .unwrap()
-                .hint_name
-                .unwrap()
-                .__contents
-                .as_bytes()
+            &neg_token.neg_hints.unwrap().hint_name.unwrap().__contents
         );
     }