drm/vc4: Delete unnecessary checks before two function calls

The following functions test whether their argument is NULL
and then return immediately.
* drm_fbdev_cma_hotplug_event
* drm_fbdev_cma_restore_mode

Thus the tests around their calls are 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/fb33d930-6a5c-c501-6676-26bd486f1cb5@users.sourceforge.net

drivers/gpu/drm/vc4/vc4_drv.c

@@ -47,8 +47,7 @@ static void vc4_lastclose(struct drm_device *dev)
 {
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
 
-	if (vc4->fbdev)
-		drm_fbdev_cma_restore_mode(vc4->fbdev);
+	drm_fbdev_cma_restore_mode(vc4->fbdev);
 }
 
 static const struct file_operations vc4_drm_fops = {

drivers/gpu/drm/vc4/vc4_kms.c

@@ -26,8 +26,7 @@ static void vc4_output_poll_changed(struct drm_device *dev)
 {
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
 
-	if (vc4->fbdev)
-		drm_fbdev_cma_hotplug_event(vc4->fbdev);
+	drm_fbdev_cma_hotplug_event(vc4->fbdev);
 }
 
 struct vc4_commit {