The ornamental design for a fanblade, as shown and described herein.
FIG. 1 is a perspective view of a fan blade showing our new design;
FIG. 2 is a top view thereof;
FIG. 3 is a bottom view thereof;
FIG. 4 is a front end view thereof;
FIG. 5 is a rear end view thereof;
FIG. 6 is a left side view thereof; and,
FIG. 7 is a right side view thereof.
The broken line showing of the fan blade in use is included for the purpose of illustrating environmental structure and forms no part of the claimed design.