The ornamental design for a lightfixture, as shown and described.
FIG. 1 is a perspective view of a light fixture showing our new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is a perspective view thereof rotated at an angled position; and,
FIG. 9 is a perspective view thereof rotated at another angled position.
The broken lines shown in the drawings are included for the purpose of illustrating elements of the light fixture that can be hung from a surface and form no part of the claimed design.