The ornamental design for a condom, as shown.
FIG. 1 is a perspective view of the condom according to the design;
FIG. 2 is a top view of FIG. 1 thereof;
FIG. 3 is a bottom view thereof;
FIG. 4 is a front view threof;
FIG. 5 is a side view thereof; and,
FIG. 6 is a back view.