The ornamental design for a guidewire, as shown and described.
FIG. 1 is a front elevational view of the guide wire, showing the new design;
FIG. 2 is a left-side elevational view thereof;
FIG. 3 is a right-side elevational view thereof;
FIG. 4 is a top plan view thereof; and,
FIG. 5 is a bottom plan view thereof.
The broken lines having larger evenly spaced gaps in the drawings are for the purpose of illustrating portions of the guide wire that form no part of the claimed design. The dot-dash broken lines depict a boundary of the claimed subject matter and form no part of the claimed design. The break lines depicted by broken lines having smaller evenly spaced gaps in the drawings indicate that the appearance of any portion of the article between the broken break lines forms no part of the claimed design.