We claim the ornamental design for a golf accessory, as shown and described.
FIG. 1 is a front perspective view showing my new design;
FIG. 2 is a front perspective view shown in an environment thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a side view thereof; and,
FIG. 8 is a side view thereof.
The broken lines showing multiple golf products in FIG. 2 are included for the purposes of illustrating environment and form no part of the claimed design.