The ornamental design for a sawhorse, as shown and described.
FIG. 1 is perspective view of the top portion of a sawhorse showing a new
design;
FIG. 2 is a rear elevation view of the same top portion of a sawhorse; and,
FIG. 3 is an enlarged fragmentary perspective view thereof, the broken
lines showing is for illustrative purposes only and forms no part of the
claimed design.