degesch: replace degesch.connect with async.dial

Halfway there, looks much saner.

plugins/degesch/last-fm.lua

@@ -118,24 +118,23 @@ end
 local running
 
 -- Initiate a connection to last.fm servers
+async, await = degesch.async, coroutine.yield
 local make_request = function (buffer, action)
 	if not user or not api_key then
 		report_error (buffer, "configuration is incomplete")
 		return
 	end
 
-	if running then running.abort () end
-
-	running = degesch.connect ("ws.audioscrobbler.com", 80, {
-		on_success = function (c, host)
-			on_connected (buffer, c, host, action)
-			running = nil
-		end,
-		on_error   = function (e)
+	if running then running:cancel () end
+	running = async.go (function ()
+		local c, host, e = await (async.dial ("ws.audioscrobbler.com", 80))
+		if e then
 			report_error (buffer, e)
-			running = nil
+		else
+			on_connected (buffer, c, host, action)
 		end
-	})
+		running = nil
+	end)
 end
 
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