i3c: master: svc: fix returnvar.cocci warning

Fix the following coccicheck warning:

drivers/i3c/master/svc-i3c-master.c:1600:5-8:
Unneeded variable: "ret". Return "0" on line 1605.

Signed-off-by: Guo Zhengkui <guozhengkui@vivo.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20220504164901.9622-1-guozhengkui@vivo.com

drivers/i3c/master/svc-i3c-master.c

@@ -1597,12 +1597,11 @@ static int __maybe_unused svc_i3c_runtime_suspend(struct device *dev)
 static int __maybe_unused svc_i3c_runtime_resume(struct device *dev)
 {
 	struct svc_i3c_master *master = dev_get_drvdata(dev);
-	int ret = 0;
 
 	pinctrl_pm_select_default_state(dev);
 	svc_i3c_master_prepare_clks(master);
 
-	return ret;
+	return 0;
 }
 
 static const struct dev_pm_ops svc_i3c_pm_ops = {