I claim the ornamental design for an light fixture, as shown and described.
FIG. 1 is a bottom, front perspective view of an light fixture showing the new design;
FIG. 2 is a top, front perspective view of the light fixture thereof;
FIG. 3 is a left side elevation view of the light fixture thereof, which is identical to the right side elevation view, the front side view, and the rear side view;
FIG. 4 is a bottom plan view of the light fixture thereof; and,
FIG. 5 is a top plan view of the light fixture thereof.
The broken lines in the figures represent unclaimed portions of the light fixture and form no part of the claimed design.