Handle division by zero after AudioData.close.

Differential Revision: https://phabricator.services.mozilla.com/D244753

bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1959072
gecko-commit: d036e94b560f58b00c397b5766aa78ed667307d7
gecko-reviewers: chunmin

Author: padenot

webcodecs/audio-data.any.js

@@ -86,6 +86,15 @@ test(t => {
 
 }, 'Verify AudioData constructors');
 
+test(t => {
+  let data = createDefaultAudioData();
+  data.close();
+  assert_equals(data.sampleRate, 0);
+  assert_equals(data.numberOfFrames, 0);
+  assert_equals(data.numberOfChannels, 0);
+  assert_equals(data.format, null);
+}, 'AudioData close');
+
 test(t => {
   let data = createDefaultAudioData();