The ornamental design for a lightfixture, as shown and described.
FIG. 1 is a top perspective view of a light fixture.
FIG. 2 is a bottom perspective view taken from a bottom, right side thereof;
FIG. 3 is a left side elevation view thereof;
FIG. 4 is a right side elevation view thereof;
FIG. 5 is a front side elevation view thereof;
FIG. 6 is a rear side elevation view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a top plan view thereof.
The light fixture is shown with a symbolic break in its length. The appearance of any portion of the article between the break lines forms no part of the claimed design.