log: Correctly handle 'log off' + add missing \n

README.md

@@ -87,7 +87,8 @@ These can be specified only outside of any configuration block.
   * `syslog`
     Send logs to the local syslog daemon.
   * `off`
-    Do nothing. Useful to disable logging fully: `log off`
+    Do nothing. Used to disable logging fully: `log off`
+    Can't be combined with other targets.
   * file path
     Write (append) logs to file..
 

config.go

@@ -142,7 +142,10 @@ func logOutput(m *config.Map, node *config.Node) (interface{}, error) {
 			}
 			outs = append(outs, syslogOut)
 		case "off":
-			outs = append(outs, nil)
+			if len(node.Args) != 1 {
+				return nil, errors.New("'off' can't be combined with other log targets")
+			}
+			return nil, nil
 		default:
 			w, err := os.OpenFile(arg, os.O_RDWR, os.ModePerm)
 			if err != nil {

log/log.go

@@ -105,7 +105,7 @@ func Syslog() (FuncLog, error) {
 		}
 
 		if err != nil {
-			fmt.Fprintf(os.Stderr, "!!! Failed to send message to syslog daemon: %v", err)
+			fmt.Fprintf(os.Stderr, "!!! Failed to send message to syslog daemon: %v\n", err)
 		}
 	}, nil
 }