The ornamental design for a pellet for filling a bone void, as shown and described.
FIG. 1 is a top and front perspective view showing my new design;
FIG. 2 is a top plan view thereof, the bottom plan view thereof being identical;
FIG. 3 is a right side elevational view thereof, the left side elevational view, front elevational view, and rear elevational view thereof being identical; and,
FIG. 4 is a cross-sectional view taken along line 4--4 of FIG. 2.