[infer] Fix resource leak in ObjectChecker

Bug: 509385
Change-Id: I6b6ff5b721d959eb0708003a40c8f97d6826ac46
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit/src/org/eclipse/jgit/lib/ObjectChecker.java

@@ -709,11 +709,12 @@ public class ObjectChecker {
 		return ptr;
 	}
 
-	@SuppressWarnings("resource")
 	@Nullable
 	private ObjectId idFor(int objType, byte[] raw) {
 		if (skipList != null) {
-			return new ObjectInserter.Formatter().idFor(objType, raw);
+			try (ObjectInserter.Formatter fmt = new ObjectInserter.Formatter()) {
+				return fmt.idFor(objType, raw);
+			}
 		}
 		return null;
 	}