The ornamental design for a poweradapter, as shown and described.
FIG. 1 is a perspective view a first embodiment of a power adapter showing our new design;
FIG. 2 is a right side view thereof, the left side view being a mirror image;
FIG. 3 is a rear view thereof;
FIG. 4 is a bottom view thereof;
FIG. 5 is a perspective view a second embodiment thereof;
FIG. 6 is a right side view thereof, the left side view being a mirror image;
FIG. 7 is a rear view thereof;
FIG. 8 is a bottom view thereof;
FIG. 9 is a perspective view a third embodiment thereof;
FIG. 10 is a right side view thereof, the left side view being a mirror image;
FIG. 11 is a rear view thereof; and,
FIG. 12 is a bottom view thereof.
The broken lines shown represent unclaimed subject matter only and form no part of the claim. Where broken lines abut a shaded surface it is understood that those broken lines represent an unclaimed boundary between claimed and unclaimed surfaces. None of the broken lines form any part of the claimed design.