Convert `use` imports to vertical layout for better readability and
maintainability.

Signed-off-by: Guru Das Srinagesh <linux@gurudas.dev>
---
Came across a recent commit bc58905eb07 ("samples: rust_misc_device: use
vertical import style") and found a few more locations that could
benefit from this cleanup. No functional changes.

Separating out patches per-subsystem as per the review feedback in [0].

Tested via:

	$ make LLVM=1 rustfmtcheck || echo "fail"
	$

Initially thought that rust-for-linux/rust-block-next was the right base
branch to use, which is why I didn't group this with [1] based on
rust-next that I sent out a short while ago. Using rust-next as base for
this patch.

[0]: https://lore.kernel.org/lkml/20260628-b4-rust-vertical-imports-v1-0-98bc71d4810b@gurudas.dev/
[1]: https://lore.kernel.org/lkml/20260705-rfl-vert-imp-v1-1-2f07946a905f@gurudas.dev/
---
 drivers/block/rnull/configfs.rs | 25 ++++++++++++++++++++-----
 drivers/block/rnull/rnull.rs    | 13 ++++++++++---
 2 files changed, 30 insertions(+), 8 deletions(-)

diff --git a/drivers/block/rnull/configfs.rs b/drivers/block/rnull/configfs.rs
index 7c2eb5c0b722..2149b47db697 100644
--- a/drivers/block/rnull/configfs.rs
+++ b/drivers/block/rnull/configfs.rs
@@ -1,15 +1,30 @@
 // SPDX-License-Identifier: GPL-2.0
 
-use super::{NullBlkDevice, THIS_MODULE};
+use super::{
+    NullBlkDevice,
+    THIS_MODULE, //
+};
 use kernel::{
-    block::mq::gen_disk::{GenDisk, GenDiskBuilder},
-    configfs::{self, AttributeOperations},
+    block::mq::gen_disk::{
+        GenDisk,
+        GenDiskBuilder, //
+    },
+    configfs::{
+        self,
+        AttributeOperations, //
+    },
     configfs_attrs,
-    fmt::{self, Write as _},
+    fmt::{
+        self,
+        Write as _, //
+    },
     new_mutex,
     page::PAGE_SIZE,
     prelude::*,
-    str::{kstrtobool_bytes, CString},
+    str::{
+        kstrtobool_bytes,
+        CString, //
+    },
     sync::Mutex,
 };
 
diff --git a/drivers/block/rnull/rnull.rs b/drivers/block/rnull/rnull.rs
index 0ca8715febe8..d58d2c4c5f63 100644
--- a/drivers/block/rnull/rnull.rs
+++ b/drivers/block/rnull/rnull.rs
@@ -10,12 +10,19 @@
         self,
         mq::{
             self,
-            gen_disk::{self, GenDisk},
-            Operations, TagSet,
+            gen_disk::{
+                self,
+                GenDisk, //
+            },
+            Operations,
+            TagSet, //
         },
     },
     prelude::*,
-    sync::{aref::ARef, Arc},
+    sync::{
+        aref::ARef,
+        Arc, //
+    },
 };
 
 module! {

---
base-commit: dc59e4fea9d83f03bad6bddf3fa2e52491777482
change-id: 20260705-rfl-vert-imp-2-9bba7706d3f0

Best regards,
--  
Guru Das Srinagesh <linux@gurudas.dev>