Don't post keycodes > 255.

If we only have keys > 255 we don't set up a key class rec, so don't post
them. It makes the server unhappy.

Signed-off-by: Julien Cristau <jcristau@debian.org>
(cherry picked from commit 7243116f55)

src/evdev.c

@@ -164,6 +164,10 @@ PostKbdEvent(InputInfoPtr pInfo, struct input_event *ev, int value)
 	warned[ev->code] = 1;
     }
 
+    /* The X server can't handle keycodes > 255 anyway, just drop them.  */
+    if (code > 255)
+        return;
+
     xf86PostKeyboardEvent(pInfo->dev, code, value);
 }