Fix cursor ref counting mistakes with sprites and xf86Cursor.c

A few cursor value assignments weren't getting correctly ref counted,
causing leaks of cursor objects.

Reviewed-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Keith Packard <keithp@keithp.com>

dix/devices.c

@@ -851,6 +851,8 @@ CloseDevice(DeviceIntPtr dev)
     }
 
     if (DevHasCursor(dev) && dev->spriteInfo->sprite) {
+	if (dev->spriteInfo->sprite->current)
+	    FreeCursor(dev->spriteInfo->sprite->current, None);
         xfree(dev->spriteInfo->sprite->spriteTrace);
         xfree(dev->spriteInfo->sprite);
     }