The ornamental design for an auxiliarydevice, as shown and described.
FIG. 1 is a perspective view of the auxiliary device;
FIG. 2 is another perspective view of the auxiliary device;
FIG. 3 is a front view of the auxiliary device;
FIG. 4 is a rear view of the auxiliary device;
FIG. 5 is a bottom view of the auxiliary device;
FIG. 6 is a top view of the auxiliary device;
FIG. 7 is a left side view of the auxiliary device; and,
FIG. 8 is a right side view of the auxiliary device.
The broken lines showing in the views are for the purpose of illustrating portions of the auxiliary device that form no part of the claimed design; the broken lines form no part of the claimed design.