The ornamental design for a corner guard, as shown and described.
The file of this patent contains at least one drawing executed in color. Copies of this patent with color drawing(s) will be provided by the Patent and Trademark Office upon request and payment of the necessary fee.
FIG. 1 is a front pictorial view of a first embodiment of a corner guard according to the new design;
FIG. 2 is a front pictorial view of a second embodiment of a corner guard according to the new design;
FIG. 3 is a transverse cross-sectional view, showing the end profile of the first embodiment; and,
FIG. 4 is a transverse cross-sectional view, showing the end profile of the second embodiment.