src: use MaybeLocal.ToLocal instead of IsEmpty

PR-URL: #35716
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

src/node_buffer.cc

@@ -424,12 +424,13 @@ MaybeLocal<Object> New(Environment* env,
                      True(env->isolate())).IsNothing()) {
     return Local<Object>();
   }
-  MaybeLocal<Uint8Array> ui = Buffer::New(env, ab, 0, length);
+  MaybeLocal<Uint8Array> maybe_ui = Buffer::New(env, ab, 0, length);
 
-  if (ui.IsEmpty())
+  Local<Uint8Array> ui;
+  if (!maybe_ui.ToLocal(&ui))
     return MaybeLocal<Object>();
 
-  return scope.Escape(ui.ToLocalChecked());
+  return scope.Escape(ui);
 }
 
 // Warning: This function needs `data` to be allocated with malloc() and not