tty: serial: ma35d1_serial: Add missing check for ioremap

Add check for ioremap() and return the error if it fails in order to
guarantee the success of ioremap().

Signed-off-by: Chen Ni <nichen@iscas.ac.cn>
Acked-by: Jacky Huang <ychuang3@nuvoton.com>
Link: https://lore.kernel.org/r/20230915071106.3347-1-nichen@iscas.ac.cn
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/ma35d1_serial.c

@@ -695,6 +695,9 @@ static int ma35d1serial_probe(struct platform_device *pdev)
 
 	up->port.iobase = res_mem->start;
 	up->port.membase = ioremap(up->port.iobase, MA35_UART_REG_SIZE);
+	if (!up->port.membase)
+		return -ENOMEM;
+
 	up->port.ops = &ma35d1serial_ops;
 
 	spin_lock_init(&up->port.lock);