The ornamental design for a hairdryer, as shown and described.
FIG. 1 is a side elevational view of the hair dryer of my new design, the opposite side being a mirror image of the side shown;
FIG. 2 is a top plan view of the hair dryer of FIG. 1;
FIG. 3 is a rear elevational view of the hair dryer of FIG. 1;
FIG. 4 is a front elevational view of the hair dryer of FIG. 1; and,
FIG. 5 is a bottom plan view of the hair dryer of FIG. 1.
The broken lines in the drawing showing the chord in FIGS. 1, 3 and 4, the grid in FIG. 4 and the mesh screen in FIG. 3 are for illustrative purposes only and form no part of the claimed design.