rust_out_of_tree: use the new allocation APIs

Required since Linux's commit 85d72be1b31d ("rust: alloc: remove
`VecExt` extension") [1]. Equivalent to Linux's commit 48dd88851bc5
("rust: treewide: switch to the kernel `Vec` type").

Link: https://lore.kernel.org/rust-for-linux/20241004154149.93856-1-dakr@kernel.org/ [1]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

Author: ojeda

rust_out_of_tree.rs

@@ -13,14 +13,14 @@ module! {
 }
 
 struct RustOutOfTree {
-    numbers: Vec<i32>,
+    numbers: KVec<i32>,
 }
 
 impl kernel::Module for RustOutOfTree {
     fn init(_module: &'static ThisModule) -> Result<Self> {
         pr_info!("Rust out-of-tree sample (init)\n");
 
-        let mut numbers = Vec::new();
+        let mut numbers = KVec::new();
         numbers.push(72, GFP_KERNEL)?;
         numbers.push(108, GFP_KERNEL)?;
         numbers.push(200, GFP_KERNEL)?;