We claim the ornamental design for a control device, as shown and described.
FIG. 1 is a perspective view of a control device according to a first embodiment of our new design.
FIG. 2 is a front view thereof.
FIG. 3 is a left side view thereof.
FIG. 4 is a right side view thereof.
FIG. 5 is a top view thereof.
FIG. 6 is a bottom view thereof.
FIG. 7 is a perspective view of a control device according to a second embodiment of our new design; and,
FIG. 8 is a front view thereof.
The left side, right side, top and bottom views of the second embodiment are identical to the left side, right side, top, and bottom views of the first embodiment.
The rear views form no part of the claimed design and are omitted.