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

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

Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

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

@@ -23,7 +23,7 @@ remove_chip() {
 
 	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