drm/vmwgfx: Stop checking for DRM_UNLOCKED

drm core enforces now for DRIVER_MODESET that all ioctls are unlocked.
And all the old nasty ones from drm core aren't allowed for modern
drivers any more. Hence this is no longer needed.
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>

drivers/gpu/drm/vmwgfx/vmwgfx_drv.c

@@ -1061,14 +1061,6 @@ static struct vmw_master *vmw_master_check(struct drm_device *dev,
 	}
 	mutex_unlock(&dev->master_mutex);
 
-	/*
-	 * Taking the drm_global_mutex after the TTM lock might deadlock
-	 */
-	if (!(flags & DRM_UNLOCKED)) {
-		DRM_ERROR("Refusing locked ioctl access.\n");
-		return ERR_PTR(-EDEADLK);
-	}
-
 	/*
 	 * Take the TTM lock. Possibly sleep waiting for the authenticating
 	 * master to become master again, or for a SIGTERM if the