buttons: make all button handler scripts return 0

this is required by the new button timeout feature

Signed-off-by: John Crispin <blogic@openwrt.org>

SVN-Revision: 46471

package/network/services/hostapd/files/wps-hotplug.sh

@@ -7,3 +7,5 @@ if [ "$ACTION" = "pressed" -a "$BUTTON" = "wps" ]; then
 		hostapd_cli -i "$socket" wps_pbc
 	done
 fi
+
+return 0