label timeout error from reuseport/poll

Godeps/_workspace/src/github.com/jbenet/go-reuseport/poll/error.go

@@ -4,6 +4,6 @@ var errTimeout = &timeoutError{}
 
 type timeoutError struct{}
 
-func (e *timeoutError) Error() string   { return "i/o timeout" }
+func (e *timeoutError) Error() string   { return "i/o timeout (reuseport poll)" }
 func (e *timeoutError) Timeout() bool   { return true }
 func (e *timeoutError) Temporary() bool { return true }