The ornamental design for a ceilingfan, as shown and described.
FIG. 1 is a perspective view;
FIG. 2 is a perspective view;
FIG. 3 is a top view;
FIG. 4 is a bottom view;
FIG. 5 is a front view;
FIG. 6 is a back view;
FIG. 7 is a side view; and,
FIG. 8 is a side view.
The broken-line disclosure represents portions of the ceiling fan in which the claimed design is embodied, but which form no part of the claimed design.