Ignore warning about unchecked cast in ChangeDraftUpdate

Fix a warning about unchecked cast in ChagneDraftUpdate by simply
ignorig it.

Release-Notes: skip
Change-Id: Ib66573e53d59b160d45b99a564262ad9f8f8f7cf

1 files changed, 3 insertions, 1 deletions

diff --git a/java/com/google/gerrit/server/ChangeDraftUpdate.java b/java/com/google/gerrit/server/ChangeDraftUpdate.java
index d9cea318a3..a3b13e5ac6 100644
--- a/java/com/google/gerrit/server/ChangeDraftUpdate.java
+++ b/java/com/google/gerrit/server/ChangeDraftUpdate.java
@@ -80,7 +80,9 @@ public interface ChangeDraftUpdate {
   default <UpdateT extends ChangeDraftUpdate> Optional<UpdateT> toOptionalChangeDraftUpdateSubtype(
       Class<UpdateT> subtype) {
     if (this.getClass().isAssignableFrom(subtype)) {
-      return Optional.of((UpdateT) this);
+      @SuppressWarnings("unchecked")
+      UpdateT update = (UpdateT) this;
+      return Optional.of(update);
     }
     return Optional.empty();
   }