The ornamental design for a dustingdevice, as shown and described.
FIG. 1 is a bottom perspective view of a dusting device according to the present disclosure;
FIG. 2 is a top perspective view of the dusting device of FIG. 1;
FIG. 3 is a first side view of the dusting device of FIG. 1, the opposite side view being identical thereto;
FIG. 4 is a second side view of the dusting device of FIG. 1, which is taken ninety degrees from the first side view of FIG. 3, the opposite side being identical thereto;
FIG. 5 is a bottom view of the dusting device of FIG. 1; and,
FIG. 6 is a bottom view of the dusting device of FIG. 1.
The broken lines in the drawings illustrating environmental structure or boundaries that form no part of the claimed design.