I claim the ornamental design for the cover for a toilet, as shown and described.
FIG. 1 is a top view of a cover for a toilet according to one embodiment of the invention;
FIG. 2 is a front view of a cover for a toilet according to one embodiment of the invention;
FIG. 3 is a left side view of a cover for a toilet according to one embodiment of the invention;
FIG. 4 is a right side view of a cover for a toilet according to one embodiment of the invention; and,
FIG. 5 is a rear view of a cover for a toilet according to one embodiment of the invention.
The broken lines showing the toilet are included for the purpose of illustrating a portion of the reusable portable cover for a toilet that form no part of the claimed design.