Fix sff panic deadlock, share the evdev probe, assorted review cleanups

main.go

@@ -23,8 +23,7 @@ type endpoint struct {
 }
 
 func (e endpoint) macString() string {
-	return fmt.Sprintf("%02x:%02x:%02x:%02x:%02x:%02x",
-		e.mac[0], e.mac[1], e.mac[2], e.mac[3], e.mac[4], e.mac[5])
+	return net.HardwareAddr(e.mac[:]).String()
 }
 
 func lookupEndpoint(name string) (endpoint, error) {
@@ -223,7 +222,7 @@ func run(aName, bName string) (err error) {
 	if err != nil {
 		return err
 	}
-	checks = append(checks, moduleChecks(modules, [2]string{a.name, b.name})...)
+	checks = append(checks, moduleChecks(modules)...)
 	if err := reportChecks("SETTINGS", checks); err != nil {
 		return err
 	}