The ornamental design for a lightfixture, as shown and described.
FIG. 1 is a top perspective view of a light fixture showing our new design;
FIG. 2 is a bottom perspective view thereof;
FIG. 3 is a side view thereof wherein the alternate side view is a mirror image of FIG. 3;
FIG. 4 is a front view thereof wherein the rear view is a mirror image of FIG. 4
FIG. 5 is a top view thereof; and,
FIG. 6 is a bottom view thereof.
The broken lines represent portions of the light fixture that form no part of the claimed design. The light fixture is shown broken away in the middle to indicate that it has no specific length other than the one shown.