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