Fixing build

Author: ryan-summers

src/control_pipe.rs

@@ -136,10 +136,11 @@ impl<B: UsbBus> ControlPipe<'_, B> {
                 let count = match self.ep_out.read(&mut self.buf[i..]) {
                     Ok(count) => count,
                     Err(UsbError::WouldBlock) => return Ok(None),
-                    Err(_) => {
+                    Err(_err) => {
                         // Failed to read or buffer overflow (overflow is only possible if the host
                         // sends more data than it indicated in the SETUP request)
                         self.set_error();
+                        usb_debug!("Failed EP0 read: {:?}", _err);
                         return Ok(None);
                     }
                 };

src/device.rs

@@ -218,7 +218,7 @@ impl<B: UsbBus> UsbDevice<'_, B> {
                             Ok(req) => req,
                             Err(_err) => {
                                 // TODO: Propagate error out of `poll()`
-                                usb_debug!("Failed to handle EP0: {_err}");
+                                usb_debug!("Failed to handle EP0: {}", _err);
                                 None
                             }
                         }
@@ -230,7 +230,7 @@ impl<B: UsbBus> UsbDevice<'_, B> {
                         Some(req) if req.direction == UsbDirection::In => {
                             if let Err(_err) = self.control_in(classes, req) {
                                 // TODO: Propagate error out of `poll()`
-                                usb_debug!("Failed to handle control request: {_err}");
+                                usb_debug!("Failed to handle control request: {}", _err);
                             }
                         }
                         Some(req) if req.direction == UsbDirection::Out => {