gpio: ftgpio: Remove unneeded ERROR check before clk_disable_unprepare

clk_disable_unprepare() already checks ERROR by using IS_ERR_OR_NULL.
Remove unneeded ERROR check for g->clk.

Signed-off-by: Wan Jiabing <[e-mail]>
Signed-off-by: Bartosz Golaszewski <[e-mail]>

drivers/gpio/gpio-ftgpio010.c

···
 	return 0;
 
 dis_clk:
-	if (!IS_ERR(g->clk))
-		clk_disable_unprepare(g->clk);
+	clk_disable_unprepare(g->clk);
+
 	return ret;
 }
 
···
 {
 	struct ftgpio_gpio *g = platform_get_drvdata(pdev);
 
-	if (!IS_ERR(g->clk))
-		clk_disable_unprepare(g->clk);
+	clk_disable_unprepare(g->clk);
+
 	return 0;
 }