The ornamental design for a frontportion of an automobile, as shown and described.
FIG. 1 is a front, perspective view of a front portion of an automobile of our new design;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a right side elevational view thereof, the left side elevational view being a mirror image thereof except for the door over the gas cap which is not present on the left side, and the windshield wipers that are not symmetrical; and,
FIG. 5 is a front elevational view thereof.
The claimed design is the dark portion of the automobile depicted, the light portion forms no part of the claimed design. The back of the design depicted is not visible during ordinary use and forms no part of the claimed design.