drm/arcpgu: Delete an unnecessary check before drm_fbdev_cma_hotplug_event()

The drm_fbdev_cma_hotplug_event() function tests whether its argument
is NULL and then returns immediately.
Thus the test around the call is not needed.

This issue was detected by using the Coccinelle software.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/dd9a16b1-234c-6776-e6d9-943a8457334e@users.sourceforge.net

drivers/gpu/drm/arc/arcpgu_drv.c

@@ -28,8 +28,7 @@ static void arcpgu_fb_output_poll_changed(struct drm_device *dev)
 {
 	struct arcpgu_drm_private *arcpgu = dev->dev_private;
 
-	if (arcpgu->fbdev)
-		drm_fbdev_cma_hotplug_event(arcpgu->fbdev);
+	drm_fbdev_cma_hotplug_event(arcpgu->fbdev);
 }
 
 static struct drm_mode_config_funcs arcpgu_drm_modecfg_funcs = {