drm: simplify the return expression of ast_drm_resume()

Simplify the return expression.

Reported-by: Zeal Robot <[e-mail]>
Signed-off-by: Minghao Chi <[e-mail]>
Acked-by: Thomas Zimmermann <[e-mail]>
Signed-off-by: Thomas Zimmermann <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/ast/ast_drv.c

···
 
 static int ast_drm_resume(struct drm_device *dev)
 {
-	int ret;
-
 	if (pci_enable_device(to_pci_dev(dev->dev)))
 		return -EIO;
 
-	ret = ast_drm_thaw(dev);
-	if (ret)
-		return ret;
-	return 0;
+	return ast_drm_thaw(dev);
 }
 
 static int ast_pm_suspend(struct device *dev)