tty: serial: 8250: serial_cs: Remove unused/unchecked variable 'err'

Fixes the following W=1 kernel build warning(s):

 drivers/tty/serial/8250/serial_cs.c: In function ‘multi_config’:
 drivers/tty/serial/8250/serial_cs.c:562:7: warning: variable ‘err’ set but not used [-Wunused-but-set-variable]

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jirislaby@kernel.org>
Cc: Colin Ian King <colin.king@canonical.com>
Cc: "David A. Hinds" <dahinds@users.sourceforge.net>
Cc: linux-serial@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20201104193549.4026187-15-lee.jones@linaro.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/8250/serial_cs.c

@@ -559,16 +559,13 @@ static int multi_config(struct pcmcia_device *link)
 	 */
 	if (info->manfid == MANFID_OXSEMI || (info->manfid == MANFID_POSSIO &&
 				info->prodid == PRODID_POSSIO_GCC)) {
-		int err;
-
 		if (link->config_index == 1 ||
 		    link->config_index == 3) {
-			err = setup_serial(link, info, base2,
-					link->irq);
+			setup_serial(link, info, base2, link->irq);
 			base2 = link->resource[0]->start;
 		} else {
-			err = setup_serial(link, info, link->resource[0]->start,
-					link->irq);
+			setup_serial(link, info, link->resource[0]->start,
+				     link->irq);
 		}
 		info->c950ctrl = base2;