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;
FIG. 3 is a front elevation view of the light fixture in accordance with my design, the opposite side being a mirror image of that shown; and,
FIG. 4 is a side elevation view of the light fixture in accordance with my design, the opposite side being a mirror image of that shown.
The top surface of the light fixture is not shown and therefore forms no part of the claimed design.
The broken-line disclosure of elements are understood to represent portions of the article in which the design is embodied, but which form no part of the claimed design.