get_current_config_value doesn't take any arguments, dev is a global variable.

Bug: https://bugs.gentoo.org/944427
--- a/usb_modeswitch.c
+++ b/usb_modeswitch.c
@@ -570,7 +570,7 @@ int main(int argc, char **argv)
 	/* Get current configuration of default device, note value if Configuration
 	 * parameter is set. Also sets active_config
 	 */
-	currentConfigVal = get_current_config_value(dev);
+	currentConfigVal = get_current_config_value();
 	if (Configuration > -1) {
 		SHOW_PROGRESS(output,"Current configuration number is %d\n", currentConfigVal);
 	} else
@@ -772,7 +772,7 @@ int main(int argc, char **argv)
 	if (Configuration > 0) {
 		if (currentConfigVal != Configuration) {
 			if (switchConfiguration()) {
-				currentConfigVal = get_current_config_value(dev);
+				currentConfigVal = get_current_config_value();
 				if (currentConfigVal == Configuration) {
 					SHOW_PROGRESS(output,"The configuration was set successfully\n");
 				} else {