The ornamental design for a walllamp, as shown and described.
1. Wall lamp
1.1 is a perspective view;
1.2 is a right side elevation view;
1.3 is a left side elevation view;
1.4 is a front view;
1.5 is a top plan view;
1.6 is a bottom plan view.
The model is a wall lamp constituted by a power cable, an upper stopper joining the cable to the wall, a bar projecting perpendicularly from the wall and a diffuser; the cable runs in contact with the wall, along a substantially vertical direction up to the stopper and then projects from the wall; the bar is positioned along the cable below the stopper; the cable engages the free end of the bar and then falls vertically; the diffuser is hung at the end of the cable.
The broken lines in the drawings illustrates portions of the wall lamp which forms no part of the claimed design.