[findbugs] Make CheckoutResult constants final

Change-Id: I9117f212e2ad7051fdc6e7417ebc7c2d15b357a8
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit/src/org/eclipse/jgit/api/CheckoutResult.java

@@ -54,18 +54,19 @@ public class CheckoutResult {
 	/**
 	 * The {@link Status#OK} result;
 	 */
-	public static CheckoutResult OK_RESULT = new CheckoutResult(Status.OK, null);
+	public static final CheckoutResult OK_RESULT = new CheckoutResult(
+			Status.OK, null);
 
 	/**
 	 * The {@link Status#ERROR} result;
 	 */
-	public static CheckoutResult ERROR_RESULT = new CheckoutResult(
+	public static final CheckoutResult ERROR_RESULT = new CheckoutResult(
 			Status.ERROR, null);
 
 	/**
 	 * The {@link Status#NOT_TRIED} result;
 	 */
-	public static CheckoutResult NOT_TRIED_RESULT = new CheckoutResult(
+	public static final CheckoutResult NOT_TRIED_RESULT = new CheckoutResult(
 			Status.NOT_TRIED, null);
 
 	/**