fixed issue with msleep

bin/msleep

@@ -6,6 +6,9 @@ elif [ "$1" = "mem" ]; then
 	TYPE="mem"
 elif [ "$1" = "disk" ]; then
 	TYPE="disk"
+else
+	echo "Usage: msleep [mem|disk]"
+	exit 1
 fi
 
 echo -n $TYPE > /sys/power/state