The ornamental design for a cornerrack, as shown and described.
FIG. 1 is a perspective view of a corner rack showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is another perspective view thereof with one tier of rack being removed;
FIG. 9 is the other perspective view thereof in a folded node with one tier of rack being removed;
FIG. 10 is the other perspective view thereof with the other tier of rack being coupled; and,
FIG. 11 is an enlarged view of an indicated portion of FIG. 8.
The broken lines shown in the figures represent portions of the corner rack that form no part of the claimed design. The dot-dash broken lines in FIGS. 3-5, 8-9 and 11 represents boundaries to the claimed design and forms no part of the claimed design. The dot dot-dash broken lines shown in FIGS. 8 and 11 represents an outline that does not form part of the claimed design.