mailbox: th1520: fix clock imbalance on probe failure

The purpose of the devm_add_action_or_reset() helper is to call the
action function in case adding an action ever fails so drop the clock
disable from the error path to avoid disabling the clocks twice.

Fixes: 5d4d263e1c6b ("mailbox: Introduce support for T-head TH1520 Mailbox driver")
Cc: Michal Wilczynski <[e-mail]>
Signed-off-by: Johan Hovold <[e-mail]>
Reviewed-by: Michal Wilczynski <[e-mail]>
Signed-off-by: Jassi Brar <[e-mail]>

drivers/mailbox/mailbox-th1520.c

···
 	}
 
 	ret = devm_add_action_or_reset(dev, th1520_disable_clk, priv);
-	if (ret) {
-		clk_bulk_disable_unprepare(ARRAY_SIZE(priv->clocks), priv->clocks);
+	if (ret)
 		return ret;
-	}
 
 	/*
 	 * The address mappings in the device tree align precisely with those