services: Add missing returns

service/clipboard.lua

@@ -15,3 +15,4 @@ function start()
    end
  end)
 end
+return {start=start}

service/screenblank.lua

@@ -21,5 +21,6 @@ function start()
     state = false
    end
   end
- end,"screenblank")
+ end, "screenblank")
 end
+return {start=start}

service/tape-devfs.lua

@@ -16,7 +16,10 @@ end
 for addr in component.list("tape_drive") do
  addNode(addr)
 end
-while true do
+
+function start()
+ return os.spawn(function()
+  while true do
    local tE = {coroutine.yield()}
    if tE[1] == "component_added" and tE[3] == "tape_drive" then
     addNode(tE[2])
@@ -25,4 +28,7 @@ while true do
      fs.remove("/dev/tape"..tostring(td[tE[2]]))
     end
    end
+  end
+ end, "tape-devfs")
 end
+return {start=start}

service/termsrv.lua

@@ -61,3 +61,4 @@ function start()
  end
  end,"termsrv")
 end
+return {start=start}

service/wolbeacon.lua

@@ -6,8 +6,10 @@ for modem in component.list("modem") do
  component.invoke(modem,"setWakeMessage",message)
 end
 
-local ltime = computer.uptime()
+function start()
-while true do
+ return os.spawn(function()
+  local ltime = computer.uptime()
+  while true do
    if computer.uptime() > ltime+delay then
     for modem in component.list("modem") do
      component.invoke(modem,"broadcast",port,message)
@@ -15,4 +17,7 @@ while true do
     ltime=computer.uptime()
    end
    coroutine.yield()
+  end
+ end, "WoLBeacon")
 end
+return {start=start}