The ornamental design for doors for an automobile, as shown and described.
FIG. 1 is a front left perspective view of a doors for an automobile of our new design;
FIG. 2 is a front right perspective view thereof;
FIG. 3 is a front view thereof, the rear view being a mirror image thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof; and,
FIG. 6 is a top plan view thereof.
The portion of the vehicle in light contrast is environment and is not a part of the claimed design. A second embodiment of the present design is a mirror image thereof.