I claim the ornamental design for a vacuum cleaner, as shown and described.
FIG. 1 is a front and right-side perspective view of a vacuum cleaner showing my new design;
FIG. 2 is a perspective view from the front and the left side of the vacuum cleaner of FIG. 1;
FIG. 3 is an elevation view of the left side vacuum cleaner of FIG. 1;
FIG. 4 is an elevation view of the right side of the vacuum cleaner of FIG. 1;
FIG. 5 is a top plan view of the vacuum cleaner of FIG. 1;
FIG. 6 is a bottom plan view of the vacuum cleaner of FIG. 1;
FIG. 7 is a front elevation view of the vacuum cleaner of FIG. 1; and,
FIG. 8 is a rear elevation view of the vacuum cleaner of FIG. 1.
The exterior casing of the front portion of the vacuum cleaner that has a circular cross-section is transparent. The parts in stippled outline do not form part of the design.