loadFontFromList returns void instead of string (flutter#22373)

Author: Emmanuel Garcia

lib/ui/text.dart

@@ -2264,7 +2264,9 @@ class ParagraphBuilder extends NativeFieldWrapperClass2 {
 ///  If this is not provided, then the family name will be extracted from the font file.
 Future<void> loadFontFromList(Uint8List list, {String? fontFamily}) {
   return _futurize(
-    (_Callback<void> callback) => _loadFontFromList(list, callback, fontFamily)
+    (_Callback<void> callback) {
+      _loadFontFromList(list, callback, fontFamily);
+    }
   ).then((_) => _sendFontChangeMessage());
 }
 
@@ -2299,4 +2301,4 @@ FutureOr<void> _sendFontChangeMessage() async {
 /// default ascent will be used.
 /// {@endtemplate}
 
-String _loadFontFromList(Uint8List list, _Callback<void> callback, String? fontFamily) native 'loadFontFromList';
+void _loadFontFromList(Uint8List list, _Callback<void> callback, String? fontFamily) native 'loadFontFromList';