The ornamental design for decking, as shown and described.
FIG. 1 is a front, left side perspective view of my design, the front right
side perspective view is a mirror image;
FIG. 2 is a top plan view of my design, the bottom plan view is a mirror
image;
FIG. 3 is a front elevation view of my design, the rear elevation view is a
mirror image; and,
FIG. 4 is a right side view of my design, the left side view is a mirror
image.
The design of my decking is of indefinite length and width as illustrated
by the broken portions in the Figures. The broken line portions in FIGS. 1
and 4 do not form part of the claimed design.