The ornamental design for a wallprotector, as shown and described.
FIG. 1 is a top, front right side perspective view of a wall protector, of my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a right side elevation view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a top, rear, right side perspective view thereof, with a top, rear, left side perspective view being identical to FIG. 8.
The dash-dash broken lines shown in the drawings depict portions of the wall protector. The dot-dash broken lines define the boundaries of the claimed design. The broken lines form no part of the claimed design.