fancontrol: Add --check option to only check configuration syntax

References: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=582979

prog/pwm/fancontrol

@@ -390,6 +390,17 @@ function CheckFiles
 	return $outdated
 }
 
+if [ "$1" == "--check" ]
+then
+	if [ -f "$2" ]
+	then
+		LoadConfig $2
+	else
+		LoadConfig /etc/fancontrol
+	fi
+	exit 0
+fi
+
 if [ -f "$1" ]
 then
 	LoadConfig $1