Of course, easy win or not, a win is important for Madrid in this match because they're the favorite. If you observe Madrid players, they are now becoming more serious to cover up their previous lapses that they had in all competitions due to the initial injury challenges that they had. Salzburg is not strong enough to stop Madrid from defeating them, because they're not as strong as Madrid.
Salzburg could lose badly without any reply when they are guests at Real Madrid's home in the next match in the Champions League this season and even Salzburg will not be able to get a single point in that match. Because when Real Madrid players are serious enough to fix their mistakes in the upcoming matches, of course it will be very torturous for teams that are less strong like Salzburg, so I will assume that Madrid will be a little easier to win the match unless there are many new mistakes from the Madrid players themselves.