dix: IsFloating() on master devices is always false

There are a few subtle bugs during startup where IsFloating() returns true
if the device is a master device that is not yet paired with its keyboard
device.

Force IsFloating() to always return FALSE for master devices, that was the
intent after all and any code that relies on the other behaviour should be
fixed instead.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Jeremy Huddleston <jeremyhu@apple.com>
Tested-by: Jon TURNEY <jon.turney@dronecode.org.uk>

dix/events.c

@@ -341,7 +341,7 @@ IsMaster(DeviceIntPtr dev)
 Bool
 IsFloating(DeviceIntPtr dev)
 {
-    return GetMaster(dev, MASTER_KEYBOARD) == NULL;
+    return !IsMaster(dev) && GetMaster(dev, MASTER_KEYBOARD) == NULL;
 }
 
 /**