The ornamental design for a bathmat, as shown and described.
FIG. 1 is a first perspective view of a bath mat showing my new design;
FIG. 2 is a second perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a back view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a top view thereof;
FIG. 8 is a bottom view thereof; and,
FIG. 9 is an enlarged view of the selected portion in FIG. 2.
The dash-dash broken lines shown in the drawings depict portions of the bath mat that form no part of the claimed design. The dot-dash broken lines depict the boundary of the bath mat and do not form a part of the claimed design. The long-short dashed broken lines in FIGS. 2 and 9 form no part of the claimed design and designate the region of the bath mat in FIG. 2 that is shown on an enlarged scale in FIG. 9.