The ornamental design for a charger, as shown and described.
FIG. 1 is a perspective view of a charger showing my new design;
FIG. 2 is a front view of the charger shown in FIG. 1;
FIG. 3 is a back view of the charger shown in FIG. 1;
FIG. 4 is a side view of the charger shown in FIG. 1;
FIG. 5 is the other side view of the charger shown in FIG. 1;
FIG. 6 is a top view of the charger shown in FIG. 1;
FIG. 7 is a bottom view of the charger shown in FIG. 1; and,
FIG. 8 is a perspective view of the charger shown in FIG. 1, shown with retractable cable partially extended.
The broken lines depicting the plug prongs and portions of the retractable cable in the drawings are included for the purpose of illustrating environmental structure and form no part of the claimed design.