ValidateTool: fix digest validation

src/org/netpreserve/jwarc/tools/ValidateTool.java

@@ -91,7 +91,7 @@ private static long readBody(MessageBody body, Consumer<ByteBuffer> consumer) th
 
     private static void validateDigest(WarcDigest digestExpected, WarcDigest digestCalculated, long size)
             throws DigestException {
-        if (!digestCalculated.equals(digestCalculated)) {
+        if (!digestExpected.equals(digestCalculated)) {
             throw new java.security.DigestException("Failed to validate digest: expected " + digestExpected + ", got "
                     + digestCalculated + " (on " + size + " bytes)");
         }