The ornamental design for a malemember for a wall hanger, as shown and described.
FIG. 1 is a plan view of a male member for a wall hanger embodying my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a bottom view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a rear view thereof; and,
FIG. 6 is an example of use thereof.
The broken line showing the environment in which the male member for a wall hanger is used is included for the purpose of illustrating environmental structure and forms no part of the claimed design.