Case for an electronic device

FIG. 1 is a front, top, and left-side perspective view of a case for an electronic device showing the claimed design;

FIG. 2 is a rear, bottom, and right-side perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear 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; and,

FIG. 8 is a bottom view thereof.

The broken lines in the figures show portions of the case for an electronic device that form no part of the claimed design.