The ornamental design for a fencepostextension, as shown and described.
FIG. 1 is a perspective front view of a fence post extension showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a sectional view taken along line 6-6 of FIG. 1;
FIG. 7 is a top view thereof; and,
FIG. 8 is a bottom view thereof.
The fence post extension is shown with a symbolic break in its length. The appearance of any portion of the article between the break lines forms no part of the claimed design.