Add pipe::NO_DATA_STAGE const for convenience.

For use in `control_req`'s buffer argument if no data stage is
required. It was either this or have a separate function.

1 files changed, 2 insertions, 2 deletions

diff --git a/usbh/src/lib.rs b/usbh/src/lib.rs
index 94230b2..70acc31 100755
--- a/usbh/src/lib.rs
+++ b/usbh/src/lib.rs
@@ -6,7 +6,7 @@ mod pipe;
 mod usbproto;
 
 use device::DeviceTable;
-use pipe::{PipeErr, PipeTable, USBPipeType};
+use pipe::{PipeErr, PipeTable, USBPipeType, NO_DATA_STAGE};
 use rb::{Reader, RingBuffer, Writer};
 use usbproto::*;
 
@@ -383,7 +383,7 @@ where
                     RequestCode::SetAddress,
                     WValue::from((device.addr, 0)),
                     0,
-                    Option::<&mut ()>::None,
+                    NO_DATA_STAGE,
                     self.millis,
                 )?;