I claim the ornamental design for a cordless blower, as shown and described.
FIG. 1 is a left perspective view of the cordless blower;
FIG. 2 is a front view of the cordless blower shown in FIG. 1;
FIG. 3 is a rear view of the cordless blower shown in FIG. 1;
FIG. 4 is a left side view of the cordless blower shown in FIG. 1;
FIG. 5 is a right side view of the cordless blower shown in FIG. 1;
FIG. 6 is a top view of the cordless blower shown in FIG. 1; and,
FIG. 7 is a bottom view of the cordless blower shown in FIG. 1.
The subject matter shown in dashed lines, and any surfaces of the design not shown, including interior surfaces, form no part of the claimed invention.