The ornamental design for a lightfixture, as shown and described.
FIG. 1 is a perspective view of a light fixture in accordance with my design;
FIG. 2 is a bottom plan view of the light fixture in accordance with my design showing the lamp in a rotated position;
FIG. 3 is a back elevation view of the light fixture in accordance with my design showing the lamp in a rotated position;
FIG. 4 is a front elevation view of the light fixture in accordance with my design showing the lamp in a rotated position;
FIG. 5 is side elevation view of the light fixture in accordance with my design showing the lamp in an alternate rotated position; and,
FIG. 6 is an opposite side elevation view of the light fixture in accordance with my design showing the lamp in a rotated position.
The broken-line disclosure of elements is understood to represent portions of the article in which the design is embodied, but which form no part of the claimed design.