Bug 1634170 - clear crypto info before reusing recycled sample. r=geckoview-reviewers,esawin

Differential Revision: https://phabricator.services.mozilla.com/D73989

mobile/android/geckoview/src/main/java/org/mozilla/gecko/media/Sample.java

@@ -52,6 +52,7 @@ public final class Sample implements Parcelable {
     private void readCrypto(final Parcel in) {
         int hasCryptoInfo = in.readInt();
         if (hasCryptoInfo == 0) {
+            cryptoInfo = null;
             return;
         }