I claim the ornamental design for a closet hanger, as shown and described.
FIG. 1 is a perspective view of a closet hanger;
FIG. 2 is a left-side elevation view thereof;
FIG. 3 is a right side elevation view thereof;
FIG. 4 is a back elevation view thereof;
FIG. 5 is a front elevation view thereof;
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is a top plan view thereof.
The broken line showing portions of the closet hanger are included for the purpose of illustrating environmental structure and form no part of the claimed design.