We claim the ornamental design for a washing machine, as shown and described.
FIG. 1 is a front/right-side/top perspective view of a washing machine showing our new design;
FIG. 2 is a front-side elevational view thereof;
FIG. 3 is a rear-side elevational view thereof;
FIG. 4 is a left-side elevational view thereof;
FIG. 5 is a right-side elevational view thereof;
FIG. 6 is a top-side elevational view thereof; and,
FIG. 7 is a bottom-side elevational view thereof.
The broken line showing of a laundry appliance top, bottom, sides and rear in FIGS. 1-7 is included for the purpose of showing environmental portions of the washing machine and forms no part of the claimed design.
The light gray pattern on the front of the washing machine is a part of the claimed design.