LibJS: Convert internal_set_prototype_of() to ThrowCompletionOr

Author: https://github.com/linusg
Commit: 8c81c84c18
Pull-request: https://github.com/SerenityOS/serenity/pull/10266
Reviewed-by: https://github.com/IdanHo ✅

Userland/Libraries/LibJS/Runtime/ReflectObject.cpp

@@ -334,7 +334,7 @@ JS_DEFINE_NATIVE_FUNCTION(ReflectObject::set_prototype_of)
     }
 
     // 3. Return ? target.[[SetPrototypeOf]](proto).
-    return Value(target.as_object().internal_set_prototype_of(proto.is_null() ? nullptr : &proto.as_object()));
+    return Value(TRY_OR_DISCARD(target.as_object().internal_set_prototype_of(proto.is_null() ? nullptr : &proto.as_object())));
 }
 
 }