package/ssdp-responder: fix warnings from check-package and shellcheck

Summary of changes:

 - Fix use of $DAEMON, found by check-package
   - Expects DAEMON to be name of daemon controlled by script, this
     causes ripple efects in rest of script
   - Recommend `chmod a-x`, .mk file installs with `-m 0755`
 - Fix shellcheck warnings:
   - Use "$VAR" in case of spaces in filenames
   - recommend not using $? in if stmt, should use `if start-stop ...`
   - mismatch in indentation in case-esac

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/ssdp-responder/S50ssdpd

@@ -1,25 +1,32 @@
 #!/bin/sh
 
-NAME=ssdpd
+DAEMON=ssdpd
-PIDFILE=/var/run/$NAME.pid
+PIDFILE=/var/run/$DAEMON.pid
-DAEMON=/usr/sbin/$NAME
+CFGFILE=/etc/default/$DAEMON
-CFGFILE=/etc/default/$NAME
 
 DAEMON_ARGS=""
 
 # Read configuration variable file if it is present
-[ -f $CFGFILE ] && . $CFGFILE
+# shellcheck source=/dev/null
+[ -r "$CFGFILE" ] && . "$CFGFILE"
 
+# shellcheck disable=SC2086
 start() {
-	printf 'Starting %s: ' "$NAME"
+	printf 'Starting %s: ' "$DAEMON"
-	start-stop-daemon -S -q -p $PIDFILE -x $DAEMON -- $DAEMON_ARGS
+	if start-stop-daemon -S -q -p "$PIDFILE" -x "$DAEMON" -- $DAEMON_ARGS; then
-	[ $? = 0 ] && echo "OK" || echo "FAIL"
+		echo "OK"
+	else
+		echo "FAIL"
+	fi
 }
 
 stop() {
-	printf 'Stopping %s: ' "$NAME"
+	printf 'Stopping %s: ' "$DAEMON"
-	start-stop-daemon -K -q -p $PIDFILE -x $DAEMON
+	if start-stop-daemon -K -q -p "$PIDFILE" -x "$DAEMON"; then
-	[ $? = 0 ] && echo "OK" || echo "FAIL"
+		echo "OK"
+	else
+		echo "FAIL"
+	fi
 }
 
 restart() {
@@ -28,15 +35,15 @@ restart() {
 }
 
 case "$1" in
-    start|stop|restart)
+	start|stop|restart)
-	"$1"
+		"$1"
-	;;
+		;;
-    reload)
+	reload)
-	restart
+		restart
-	;;
+		;;
-    *)
+	*)
-	echo "Usage: $0 {start|stop|restart|reload}"
+		echo "Usage: $0 {start|stop|restart|reload}"
-	exit 1
+		exit 1
 esac
 
 exit $?