The ornamental design for a lightfixture, as shown and described.
FIG. 1 is a front perspective view of a light fixture.
FIG. 2 is a rear perspective view of the light fixture of FIG. 1.
FIG. 3 is a front elevation view of the light fixture of FIG. 1.
FIG. 4 is a top plan view of the light fixture of FIG. 1.
FIG. 5 is a right side elevation view of the light fixture of FIG. 1, the left side elevation view being a mirror image of the right side elevation view; and,
FIG. 6 is a rear elevation view of the light fixture of FIG. 1.
The broken lines illustrate environment of the claimed design, and form no part of the claimed design.