Fix SipHash implementation

h2/src/tools/org/h2/dev/hash/MinimalPerfectHash.java

@@ -753,7 +753,7 @@ public class MinimalPerfectHash<K> {
                         m |= ((long) b[off + i] & 255) << (8 * i);
                     }
                     if (i < 8) {
-                        m |= ((long) b.length) << 56;
+                        m |= ((long) end - start) << 56;
                     }
                     v3 ^= m;
                     repeat = 2;