The ornamental design for a lightfixture, as shown and described.
FIG. 1 is a front perspective view of a light fixture in accordance with my design;
FIG. 2 is a back perspective view of the light fixture in accordance with my design;
FIG. 3 is a side elevation view of the light fixture in accordance with my design, all side views being identical;
FIG. 4 is a back plan view of the light fixture in accordance with my design; and,
FIG. 5 is a front plan view of the light fixture in accordance with my design.
The broken lines shown in the drawings are for the purpose of illustrating unclaimed portions of the light fixture and form no part of the claimed design.