The ornamental design for a liner for a waterfowlwindsock decoy, as shown and described.
FIG. 1 is a perspective view of a waterfowl windsock decoy;
FIG. 2 is a side elevational view of the decoy of FIG. 1 (from the left as viewed in FIG. 1; the side elevational view from the right is a mirror image);
FIG. 3 is a top view of the decoy of FIG. 1;
FIG. 4 is a bottom view of the decoy of FIG. 1;
FIG. 5 is a front view of the decoy of FIG. 1; and,
FIG. 6 is a rear view of the decoy of FIG. 1.
The dashed lines in the FIGS. are for illustrative purposes only and form no part of the claimed design.