tty: serial: owl: Fix missing clk_disable_unprepare() in owl_uart_probe

Fix the missing clk_disable_unprepare() before return
from owl_uart_probe() in the error handling case.

Fixes: abf42d2f ("tty: serial: owl: add "much needed" clk_prepare_enable()")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Link: https://lore.kernel.org/r/20220307105135.11698-1-linmq006@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/owl-uart.c

@@ -731,6 +731,7 @@ static int owl_uart_probe(struct platform_device *pdev)
 	owl_port->port.uartclk = clk_get_rate(owl_port->clk);
 	if (owl_port->port.uartclk == 0) {
 		dev_err(&pdev->dev, "clock rate is zero\n");
+		clk_disable_unprepare(owl_port->clk);
 		return -EINVAL;
 	}
 	owl_port->port.flags = UPF_BOOT_AUTOCONF | UPF_IOREMAP | UPF_LOW_LATENCY;