The ornamental design for an automobile, as shown and described.
FIG. 1 is a front and right side perspective view of an automobile showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view thereof; and,
FIG. 6 is a top plan view thereof.
The central spoke and tri- spike hub portions of the wheels are shown for illustrative and environmetal purposes and form no part of the claimed design.