device: remove deviceStateNew

It's never used and we won't have a use for it. Also, move to go-running
stringer, for those without GOPATHs.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

device/device.go

@@ -91,20 +91,18 @@ type Device struct {
 }
 
 // deviceState represents the state of a Device.
-// There are four states: new, down, up, closed.
-// However, state new should never be observable.
+// There are three states: down, up, closed.
 // Transitions:
 //
-//   new -> down -----+
-//            ↑↓      ↓
-//            up -> closed
+//   down -----+
+//     ↑↓      ↓
+//     up -> closed
 //
 type deviceState uint32
 
-//go:generate stringer -type deviceState -trimprefix=deviceState
+//go:generate go run golang.org/x/tools/cmd/stringer -type deviceState -trimprefix=deviceState
 const (
-	deviceStateNew deviceState = iota
-	deviceStateDown
+	deviceStateDown deviceState = iota
 	deviceStateUp
 	deviceStateClosed
 )

device/devicestate_string.go

@@ -4,19 +4,9 @@ package device
 
 import "strconv"
 
-func _() {
-	// An "invalid array index" compiler error signifies that the constant values have changed.
-	// Re-run the stringer command to generate them again.
-	var x [1]struct{}
-	_ = x[deviceStateNew-0]
-	_ = x[deviceStateDown-1]
-	_ = x[deviceStateUp-2]
-	_ = x[deviceStateClosed-3]
-}
+const _deviceState_name = "DownUpClosed"
 
-const _deviceState_name = "NewDownUpClosed"
-
-var _deviceState_index = [...]uint8{0, 3, 7, 9, 15}
+var _deviceState_index = [...]uint8{0, 4, 6, 12}
 
 func (i deviceState) String() string {
 	if i >= deviceState(len(_deviceState_index)-1) {