[PATCH 4/5] rust: usb: use "kernel vertical" style for imports

[Danilo Krummrich <dakr@kernel.org>]

Convert all imports to use "kernel vertical" style.

With this, subsequent patches neither introduce unrelated changes nor
leave an inconsistent import pattern.

While at it, drop unnecessary imports covered by prelude::*.

Link: https://docs.kernel.org/rust/coding-guidelines.html#imports
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
---
@Greg: If you agree I will take this through the driver-core tree. I will have
driver-core patches building on top of this.
---
 rust/kernel/usb.rs              | 21 +++++++++++++++------
 samples/rust/rust_driver_usb.rs | 10 +++++++++-
 2 files changed, 24 insertions(+), 7 deletions(-)

diff --git a/rust/kernel/usb.rs b/rust/kernel/usb.rs
index d10b65e9fb6a..99b07b5ac491 100644
--- a/rust/kernel/usb.rs
+++ b/rust/kernel/usb.rs
@@ -6,14 +6,23 @@
 //! C header: [`include/linux/usb.h`](srctree/include/linux/usb.h)
 
 use crate::{
-    bindings, device,
-    device_id::{RawDeviceId, RawDeviceIdIndex},
+    bindings,
+    device,
+    device_id::{
+        RawDeviceId,
+        RawDeviceIdIndex, //
+    },
     driver,
-    error::{from_result, to_result, Result},
+    error::{
+        from_result,
+        to_result, //
+    },
     prelude::*,
-    str::CStr,
-    types::{AlwaysRefCounted, Opaque},
-    ThisModule,
+    types::{
+        AlwaysRefCounted,
+        Opaque, //
+    },
+    ThisModule, //
 };
 use core::{
     marker::PhantomData,
diff --git a/samples/rust/rust_driver_usb.rs b/samples/rust/rust_driver_usb.rs
index 4eaad14867b2..ab72e99e1274 100644
--- a/samples/rust/rust_driver_usb.rs
+++ b/samples/rust/rust_driver_usb.rs
@@ -3,7 +3,15 @@
 
 //! Rust USB driver sample.
 
-use kernel::{device, device::Core, prelude::*, sync::aref::ARef, usb};
+use kernel::{
+    device::{
+        self,
+        Core, //
+    },
+    prelude::*,
+    sync::aref::ARef,
+    usb, //
+};
 
 struct SampleDriver {
     _intf: ARef<usb::Interface>,
-- 
2.52.0