The ornamental design for doors for an automobile, as shown and described.
FIG. 1 is a front left perspective view of doors for an automobile showing our new design;
FIG. 2 is a rear left perspective view thereof;
FIG. 3 is a left side elevation view thereof;
FIG. 4 is right side elevation view thereof;
FIG. 5 is a front view thereof;
FIG. 6 is a rear view thereof; and,
FIG. 7 is a top plan view thereof.
The interior portion of the doors form no part of the claimed design. The portion of the automobile in light contrast is environment and forms no part of the claimed design.