We claim the ornamental design for a golf club cover, as shown and described.
FIG. 1 is a perspective view of our design for a golf club cover;
FIG. 2 is a front view of the design for a golf club cover shown in FIG. 1;
FIG. 3 is a left side elevational view of the design for a golf club cover shown in FIG. 1;
FIG. 4 is a top view of the design for a golf club cover shown in FIG. 1;
FIG. 5 is a rear view of the design for a golf club cover shown in FIG. 1;
FIG. 6 is a right side elevational view of the design for a golf club cover shown in FIG. 1;
FIG. 7 is a bottom view of the design for a golf club cover shown in FIG. 1; and,
FIG. 8 is a perspective view of the design for a golf club cover shown in FIG. 1, including a shaft and grip portion of a golf club extending therefrom and shown in broken lines, the shaft and grip portions of the golf club forming no part of the claimed invention.