The ornamental design for the light fixture, as shown and described.
FIG. 1 is a perspective view of thereof;
FIG. 2 is a front view thereof;
FIG. 3 is a side view thereof, with the opposite side being identical.
FIG. 4 is a top view thereof; and,
FIG. 5 is a bottom view thereof.
The break lines shown in the drawings indicate that the appearance of any portion of the article between break lines forms no part of the claimed design; and the broken lines in the illustration depict parts of the light fixture that form no part of the claimed design.