What is claimed is the ornamental design for a hedge trimmer, as shown and described.
FIG. 1 is an enlarged right side elevational view of a hedge trimmer showing my new design;
FIG. 2 is a left side elevational view thereof;
FIG. 3 is an enlarged bottom plan view thereof;
FIG. 4 is an enlarged top plan view thereof;
FIG. 5 is an enlarged front elevational view thereof;
FIG. 6 is an enlarged rear elevational view thereof; and,
FIG. 7 is a perspective view thereof.
The broken lines in the drawings illustrate portions of the hedge trimmer and form no part of the claimed design. Any surface shading is used solely to show the character or contour of the surfaces represented.