The ornamental design for a headlight, as shown and described.
FIG. 1 is a top, front, left perspective view of a headlight, showing our new design;
FIG. 2 is a bottom, rear, right perspective view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is right side elevation view thereof;
FIG. 6 is left side elevation view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The broken lines of even length shown in the drawings illustrate portions of the headlight that form no part of the claimed design. The uneven length broken lines illustrates the boundary of the claimed design and form no part thereof.