The ornamental design for a spoiler, as shown and described.
FIG. 1 is a right front perspective view of a spoiler for a vehicle according to the present invention.
FIG. 2 is a left rear perspective view of the spoiler shown in FIG. 1.
FIG. 3 is a left front perspective view thereof.
FIG. 4 is a right rear perspective view thereof.
FIG. 5 is a front view thereof.
FIG. 6 is a rear view thereof.
FIG. 7 is a left side view thereof.
FIG. 8 is a right side view thereof.
FIG. 9 is a top view thereof; and,
FIG. 10 is a right front perspective view of the spoiler shown in FIGS. 1-9, with the spoiler mounted to the rear of a vehicle, and the rest of the vehicle shown in de-emphasized and half-tone shading. The broken lines and the area within the broken lines illustrate environmental subject matter that forms no part of the claimed design.