tty: serial: bcm63xx: fix missing clk_put() in bcm63xx_uart

This patch fixes below error reported by coccicheck

drivers/tty/serial/bcm63xx_uart.c:848:2-8: ERROR: missing clk_put;
clk_get on line 842 and execution via conditional on line 846

Fixes: ab4382d ("tty: move drivers/serial/ to drivers/tty/serial/")
Reported-by: Hulk Robot <[email protected]>
Signed-off-by: Zou Wei <[email protected]>
Cc: stable <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: SamuelZOU

drivers/tty/serial/bcm63xx_uart.c

@@ -843,8 +843,10 @@ static int bcm_uart_probe(struct platform_device *pdev)
 	if (IS_ERR(clk) && pdev->dev.of_node)
 		clk = of_clk_get(pdev->dev.of_node, 0);
 
-	if (IS_ERR(clk))
+	if (IS_ERR(clk)) {
+		clk_put(clk);
 		return -ENODEV;
+	}
 
 	port->iotype = UPIO_MEM;
 	port->irq = res_irq->start;