The ornamental design for a handleset, as shown and described.
FIG. 1 is a front perspective view of a handleset showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a top view thereof; and,
FIG. 6 is a bottom view thereof.
The broken line showing of the circular lock region and keyway of the handleset represents unclaimed subject matter and forms no part of the claimed design.