The ornamental design for a fireplace, as shown and described.
FIG. 1 is a front perspective view of the fireplace;
FIG. 2 is a front elevation view of the fireplace of FIG. 1;
FIG. 3 is a rear elevation view of the fireplace of FIG. 1;
FIG. 4 is a left-side elevation view of the fireplace of FIG. 1;
FIG. 5 is a right-side elevation view of the fireplace of FIG. 1;
FIG. 6 is a top plan view of the fireplace of FIG. 1; and,
FIG. 7 is a bottom plan view of the fireplace of FIG. 1.
The broken line showing of a grate and ventilation opening is included for the purpose of illustrating the environment of the design and forms no part of the claimed design.