The ornamental design for a pocketknife, as shown and described.
FIG. 1 is a perspective view of the design for a pocketknife shown in a closed position;
FIG. 2 is a front view of the pocketknife of FIG. 1;
FIG. 3 is a back view of the pocketknife of FIG. 1;
FIG. 4 is a first side view of the pocketknife of FIG. 1;
FIG. 5 is a second side view of the pocketknife of FIG. 1;
FIG. 6 is a top view of the pocketknife of FIG. 1;
FIG. 7 is a bottom view of the pocketknife of FIG. 1; and,
FIG. 8 is a perspective view of the pocketknife of FIG. 1 shown in an open position.
The broken line showing of the pocketknife implements, internal frame elements, serrated blade, and hexagon-shaped cut-outs is for illustrative purposes only and form no part of the claimed design.