ddns-scripts: fix luci XHR timeout when restarting ddns service

Redirect stdout and stderr to /dev/null when starting/restarting the ddns
service in the background. Without this redirection, file descriptors are
inherited by the child process, preventing proper process detachment and
causing luci's XHR requests to timeout.

net/ddns-scripts/Makefile

@@ -8,7 +8,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=ddns-scripts
 PKG_VERSION:=2.8.2
-PKG_RELEASE:=85
+PKG_RELEASE:=86
 
 PKG_LICENSE:=GPL-2.0
 

net/ddns-scripts/files/usr/lib/ddns/dynamic_dns_lucihelper.sh

@@ -149,7 +149,7 @@ case "$1" in
 	start)
 		[ -z "$SECTION" ] &&  usage_err "command 'start': 'SECTION' not set"
 		if [ "$VERBOSE" -eq 0 ]; then	# start in background
-			"$DDNSPRG" -v 0 -S "$SECTION" -- start &
+			("$DDNSPRG" -v 0 -S "$SECTION" -- start >/dev/null 2>&1 &)
 		else
 			"$DDNSPRG" -v "$VERBOSE" -S "$SECTION" -- start
 		fi
@@ -160,7 +160,7 @@ case "$1" in
 	restart)
 		"$DDNSPRG" -- stop
 		sleep 1
-		"$DDNSPRG" -- start
+		"$DDNSPRG" -- start >/dev/null 2>&1
 		;;
 	stop)
 		if [ -n "$SECTION" ]; then