The ornamental design for a frontend of a motor vehicle, as shown and described.
FIG. 1 is a top perspective view of a front end of a motor vehicle showing our new design;
FIG. 2 is an enlarged front perspective view thereof;
FIG. 3 is an enlarged side elevational view thereof, the opposite side being a mirror image thereof;
FIG. 4 is a front elevational view thereof; and,
FIG. 5 is an enlarged top plan view thereof.
The de-emphasized and halftone portions shown in the drawings illustrate environmental structure for the front portion of a motor vehicle that forms no part of the claimed design.