server/tests remove useless assignment
server/tests remove useless assignment

This was detected by clang-static-analyzer.

ya-mouse/spice,freedesktop-unofficial-mirror/spice__spice,dezelin/spice,Fantu/spice,elmarco/spice,freedesktop-unofficial-mirror/spice__spice,fgouget/spice,SPICE/spice,mathslinux/spice,alon/spice-server,ya-mouse/spice,alon/spice-server,SPICE/spice,fgouget/spice,mathslinux/spice,freedesktop-unofficial-mirror/spice__spice,mathslinux/spice,elmarco/spice,ya-mouse/spice,elmarco/spice,Fantu/spice,alon/spice-server,Fantu/spice,elmarco/spice,dezelin/spice,dezelin/spice,freedesktop-unofficial-mirror/spice__spice,SPICE/spice,fgouget/spice,freedesktop-unofficial-mirror/spice__spice,alon/spice-server,mathslinux/spice,elmarco/spice,dezelin/spice,fgouget/spice,dezelin/spice,Fantu/spice,alon/spice-server,mathslinux/spice