The ornamental design for a cushioningdevice, as shown and described.
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FIG. 1 is a perspective view of a cushioning device showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a back view thereof;
FIG. 6 is a left side elevational view thereof; and,