The ornamental design for a linecradle, as shown and described.
FIG. 1 is a top perspective view of a line cradle according to the present design;
FIG. 2 is a bottom perspective view of the line cradle according to the present design;
FIG. 3 is a front view of the line cradle according to the present design;
FIG. 4 is a rear view of the line cradle according to the present design;
FIG. 5 is a top plan view of the line cradle according to the present design;
FIG. 6 is a bottom plan view of the line cradle according to the present design;
FIG. 7 is right side elevational view of the line cradle according to the present design, the left side elevational view being a minor image thereof; and,
FIG. 8 is a perspective view of a line cradle according to the present design in a representative environment, the elements shown in dashed lines are for illustration purposes only and form no part of the present invention.