The ornamental design for a headlamp for an automobile, as shown and described.
FIG. 1 is a front elevational view of a headlamp for an automobile in accordance with my new design;
FIG. 2 is a rear elevational view of the headlamp in accordance with our new design of FIG. 1;
FIG. 3 is a top plan view of the headlamp in accordance with my new design of FIGS. 1 and 2;
FIG. 4 is a bottom plan view of the headlamp in accordance with my new design of FIGS. 1 to 3;
FIG. 5 is a right side elevational view of the headlamp in accordance with my new design of FIGS. 1 to 4;
FIG. 6 is a left side elevational view of the headlamp in accordance with my new design of FIGS. 1 to 5; and
FIG. 7 is a front side perspective view of the headlamp in accordance with my new design of FIGS. 1 to 6; and,
FIG. 8 is a front side perspective view of the headlamp in accordance with my new design of FIGS. 1 to 6, but with the lens of the headlamp removed to better illustrate interior design features of the headlamp.