The ornamental design for a lightingfixture, as shown and described.
FIG. 1 is a perspective view of a lighting fixture, illustrating our new design;
FIG. 2 is a side elevational view of one side of the lighting fixture;
FIG. 3 is a side elevational view of the other side of the lighting fixture;
FIG. 4 is a front elevational view of the lighting fixture;
FIG. 5 is a rear elevational view of the lighting fixture;
FIG. 6 is a top plan view of the lighting fixture; and,
FIG. 7 is a bottom plan view of the lighting fixture.
In the drawing figures, the broken lines immediately adjacent the shaded areas represent the bounds of the claimed design. The broken lines form no part of the claimed design.