magic number: make 8 years in seconds a constant

scripts/core/sxmo_screenlock.sh

@@ -131,8 +131,10 @@ elif [ "$1" = "crust" ] ; then
 
 	xset dpms force off
 	suspend_time="$(($(mnc)-10))"
-	if [ "$suspend_time" -gt 268435455 ]; then
+
-		suspend_time=268435455
+	YEARS8_TO_SEC=268435455
+	if [ "$suspend_time" -gt "$YEARS8_TO_SEC" ]; then
+		suspend_time="$YEARS8_TO_SEC"
 	fi
 	if [ "$suspend_time" -gt 0 ]; then
 		rtcwake -m mem -s "$suspend_time"