The ornamental design for a groinprotector, as shown and described.
FIG. 1 is front elevational view of a groin protector showing our new design, and showing the groin protector being worn by an individual; and,
FIG. 2 is a another front elevational view of a groin protector showing the groin protector laid out flat.
The back of the groin protector is not shown and is not visible in use; it forms no part of the claimed design.
The short dash, long dash broken line representation of an individual in FIG. 1 indicates the use of the claimed design and is for illustrative purposes only; these broken lines form no part of the claimed design. The regular dashed lines within the solid line boundaries of the groin protector indicate stitch patterns, which form part of the claimed design.