The ornamental design for a housing, as shown and described.
FIG. 1 is a perspective view from below of a housing in accordance with my design;
FIG. 2 is a front elevation view of the housing in accordance with my design;
FIG. 3 is an enlarged top plan view of the housing in accordance with my design;
FIG. 4 is an enlarged bottom plan view of the housing in accordance with my design;
FIG. 5 is a greatly enlarged front elevation view of the housing in accordance with my design;
FIG. 6 is a greatly enlarged back elevation view of the housing in accordance with my design; and,
FIG. 7 is a greatly enlarged side elevation view of the housing in accordance with my design, the opposite view being a mirror image of that shown.
The broken line showing of a ceiling fan canopy, support pole, blade irons, switch housing and blades is included for the purpose of illustrating environmental structure and forms no part of the claimed design.