The ornamental design for an automobile, as shown and described.
FIG. 1 is a perspective view of an automobile in accordance with my design as viewed from the front left;
FIG. 2 is a perspective view of my design as viewed from the left rear;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a left side view thereof, with the right side view being a substantial mirror image of the left side view; and,
FIG. 5 is a rear elevational view.
The broken lines showing the mirrors, door handles, tires and wheels in FIGS. 1-5 are for illustrative purposes only and form no part of the claimed design.