I claim the ornamental design for a lighting fixture, as shown and described.
FIG. 1 is a perspective front view of a first embodiment of the light fixture showing the new design, for which a perspective view rotated 120° with respect thereto would be identical, and for which a perspective view rotated 240° with respect thereto would be identical; and,
FIG. 2 is a perspective front view of a second embodiment of the light fixture showing the new design, for which a perspective view rotated 120° with respect thereto would be identical, and for which a perspective view rotated 240° with respect thereto would be identical.
The broken lines immediately adjacent the shaded areas represent the bounds of the claimed design, while all other broken lines (e.g., shades and shade supports) are directed to environment and are for illustrative purposes only; the broken lines form no part of the claimed design.