fix syntax

clipboard.c

@@ -66,13 +66,14 @@ JSC_CCALL(clipboard_get_mime_types,
   size_t count = 0;
   char **types = SDL_GetClipboardMimeTypes(&count);
   if (!types) return JS_NewArray(js);
-  
-  JSValue arr = JS_NewArray(js);
+
+  JS_FRAME(js);
+  JS_LOCAL(arr, JS_NewArray(js));
   for (size_t i = 0; i < count; i++) {
-    JS_SetPropertyUint32(js, arr, i, JS_NewString(js, types[i]));
+    JS_SetPropertyNumber(js, arr, i, JS_NewString(js, types[i]));
   }
   SDL_free(types);
-  return arr;
+  JS_RETURN(arr);
 )
 
 static const JSCFunctionListEntry js_clipboard_funcs[] = {