The ornamental design for a devicecase, as shown and described.
FIG. 1 is a top perspective view of a device case.
FIG. 2 is a front elevational view thereof.
FIG. 3 is a rear elevational view thereof.
FIG. 4 is a top plan view thereof.
FIG. 5 is a left elevational view thereof; and,
FIG. 6 is a right elevational view thereof.
The broken lines showing stitching do not form part of the claimed design, all other broken lines show portions of the device case that form no part of the claimed design.