Update error message

Author: lafoletc

contrib/platform/test/com/sun/jna/platform/unix/X11Test.java

@@ -124,8 +124,7 @@ public void testXQueryExtension() {
         // check if the XTEST extension is available
         if (X11.INSTANCE.XQueryExtension(display, "XTEST", opcode, first_event, first_error)) {
             // Opcode for extension should be assigned in range 128-255
-            Assert.assertTrue("Wrong value for opcode returned", opcode.getValue() >= 128);
-            Assert.assertTrue("Wrong value for opcode returned", opcode.getValue() <= 255);
+            Assert.assertTrue("Value for opcode should be between 128-255.", (opcode.getValue() & 0x80) > 0);
             // No first_event defined for XTEST
             Assert.assertEquals("Wrong value for first_event returned", 0, first_event.getValue());
             // No first_error defined for XTEST