The ornamental design for a cornerlamp, as shown and described.
FIG. 1 is an exploded perspective view of a corner lamp, showing my new design;
FIG. 2 is another perspective view thereof;
FIG. 3 is a perspective view shown in a state of use;
FIG. 4 is a front view thereof;
FIG. 5 is a back view thereof;
FIG. 6 is a left side view thereof;
FIG. 7 is a right side view thereof;
FIG. 8 is a top plan view thereof; and,
FIG. 9 is a bottom plan view thereof.
The dashed or broken lines shown in the drawings depict portions of the corner lamp in which the design is embodied that form no part of the claimed design.