The ornamental design for a headlight for a vehicle, as shown and described.
FIG. 1 is a right perspective view of a first embodiment of a headlight for a vehicle according to my novel design;
FIG. 2 is a front view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a right side view thereof; and
FIG. 5 is a top, perspective view thereof.
FIG. 6 is a left perspective view of a second embodiment of the headlight for a vehicle according to my novel design;
FIG. 7 is a front view thereof;
FIG. 8 is a top view thereof;
FIG. 9 is a left side view thereof; and,
FIG. 10 is a top, perspective view thereof.
The broken lines are for illustrative purposes only and form no part of the claimed design. Also enclosed is a set of photographs of an embodiment of the design.