The ornamental design for a walllamp, as shown and described.
1. Wall lamp
1.1 is a front perspective view.
1.2 is a front view.
1.3 is a rear view.
1.4 is a top view.
1.5 is a bottom view.
1.6 is a right side view.
1.7 is a left side view.
The model consists of a wall lamp; the lamp comprises a flexible band to be joined to the wall in an upper point and a lower point; moreover the lamp comprises a light diffuser having a circular shape; the light source is housed into the light diffuser; the light diffuser is put between the circular bend and the wall and rests in its position due to the action of the formed band.