The ornamental design for a cordlock, as shown and described.
FIG. 1 is a perspective view of a cord lock showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a plan view thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is a right side view thereof, a left side view being symmetrical to the right side view;
FIG. 7 is shown separated for ease of illustration. The broken line showing of the cord lock is included for illustrating portions of the article and form no part of the claimed design; and,
FIG. 8 is a perspective view of the cord lock, where in the cord lock is released.