selftests: gpio: gpio-sim: avoid forking test twice

Use '-o' within [] in order to avoid spawning two processes for test.

Suggested-by: Andy Shevchenko <[e-mail]>
Signed-off-by: Bartosz Golaszewski <[e-mail]>
Reviewed-by: Andy Shevchenko <[e-mail]>

tools/testing/selftests/gpio/gpio-sim.sh

···
 
 	for FILE in $CONFIGFS_DIR/$CHIP/*; do
 		BANK=`basename $FILE`
-		if [ "$BANK" = "live" ] || [ "$BANK" = "dev_name" ]; then
+		if [ "$BANK" = "live" -o "$BANK" = "dev_name" ]; then
 			continue
 		fi