The ornamental design for a desklamp, as shown and described.
FIG. 1 is a front elevational view of a desk lamp showing my new design;
FIG. 2 is a left side elevational view of the desk lamp of FIG. 1;
FIG. 3 is a right side elevational view of the desk lamp of FIG. 1;
FIG. 4 is a top plan view of the desk lamp of FIG. 1;
FIG. 5 is a bottom plan view of the desk lamp of FIG. 1; and,
FIG. 6 is a perspective view of the desk lamp of FIG. 1.
In the design, the rear elevational view is the mirror of the front elevational view, and accordingly, an additional figure for the rear elevational view is not included.