tty: xilinx_uartps: Check clk_enable return value

If clocks are not enabled the register access may hang the system.
Check for the clock enable return value and bail out if not enabled.
Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Link: https://lore.kernel.org/r/20220729114748.18332-2-shubhrajyoti.datta@xilinx.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/xilinx_uartps.c

@@ -1329,12 +1329,20 @@ static int cdns_uart_resume(struct device *device)
 	unsigned long flags;
 	u32 ctrl_reg;
 	int may_wake;
+	int ret;
 
 	may_wake = device_may_wakeup(device);
 
 	if (console_suspend_enabled && uart_console(port) && !may_wake) {
-		clk_enable(cdns_uart->pclk);
-		clk_enable(cdns_uart->uartclk);
+		ret = clk_enable(cdns_uart->pclk);
+		if (ret)
+			return ret;
+
+		ret = clk_enable(cdns_uart->uartclk);
+		if (ret) {
+			clk_disable(cdns_uart->pclk);
+			return ret;
+		}
 
 		spin_lock_irqsave(&port->lock, flags);