The ornamental design for a hearingaid, as shown and described.
FIG. 1 is a bottom and rear perspective view of a hearing aid, with the environmental elements in broken lines;
FIG. 2 is a top and front perspective view thereof;
FIG. 3 is another bottom and rear perspective view thereof, with the environmental elements removed for clarity;
FIG. 4 is a rear perspective view thereof;
FIG. 5 is a bottom perspective view thereof;
FIG. 6 is a front perspective view thereof;
FIG. 7 is a top perspective view thereof;
FIG. 8 is a side view thereof; and,
FIG. 9 is another side view thereof.
The broken lines in FIGS. 1 and 2 represent the environment, and the broken lines in FIG. 4 are included for the purpose of illustrating a portion of the hearing aid that forms no part of the claimed design. None of the broken lines form part of the claimed design.