The ornamental design for an adaptor, as shown and described.
FIG. 1 is a perspective view of an adaptor showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a back 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; and,
FIG. 7 is a bottom view thereof.
The broken lines shown in the drawings depict portions of the adaptor in which the design is embodied that form no part of the claimed design.
The adaptor is shown with a symbolic break in its length. The appearance of any portion of the article between the break lines forms no part of the claimed design.