The ornamental design for a confection, as shown and described.
FIG. 1 is a perspective view of a confection 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; and,
FIG. 6 is a top view thereof.
The greyscale shading shown in FIGS. 1-6 is provided solely for the purpose of showing surface contours. The dash-dot lines in FIGS. 1-6 and the areas within the dash-dot lines shown in phantom show portions of the confection that form no part of the claimed design.