I claim the ornamental design for a wallet, as shown and described.
FIG. 1 is a perspective view of a first embodiment of a wallet, with the front closing flap shown in a closed position;
FIG. 2 is a second perspective view thereof, with the front closing flap shown in an open position; and,
FIG. 3 is a perspective view of a second embodiment of a wallet, with the front closing flap shown in an open position.
The shape and features shown in broken line, of the wallet, in the accompanying Figures, are for illustrative purposes only and form no part of the claimed design.