drm: bridge: adv7511: Remove redundant null check before clk_disable_unprepare

Because clk_disable_unprepare() already checked NULL clock parameter,
so the additional check is unnecessary, just remove them.
Signed-off-by: Xu Wang <vulab@iscas.ac.cn>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

drivers/gpu/drm/bridge/adv7511/adv7511_drv.c

@@ -1292,8 +1292,7 @@ static int adv7511_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
 
 err_unregister_cec:
 	i2c_unregister_device(adv7511->i2c_cec);
-	if (adv7511->cec_clk)
-		clk_disable_unprepare(adv7511->cec_clk);
+	clk_disable_unprepare(adv7511->cec_clk);
 err_i2c_unregister_packet:
 	i2c_unregister_device(adv7511->i2c_packet);
 err_i2c_unregister_edid:
@@ -1311,8 +1310,7 @@ static int adv7511_remove(struct i2c_client *i2c)
 	if (adv7511->type == ADV7533 || adv7511->type == ADV7535)
 		adv7533_detach_dsi(adv7511);
 	i2c_unregister_device(adv7511->i2c_cec);
-	if (adv7511->cec_clk)
-		clk_disable_unprepare(adv7511->cec_clk);
+	clk_disable_unprepare(adv7511->cec_clk);
 
 	adv7511_uninit_regulators(adv7511);