rust: samples: fix init argument

After commit c96b547:
    rust: Add `name` argument to Module::init()
init needs a name argument. Since both rust samples were made
    before that, they fail to compile.

samples/rust/rust_minimal.rs

@@ -3,6 +3,7 @@
 //! Rust minimal sample.
 
 use kernel::prelude::*;
+use kernel::str::CStr;
 
 module! {
     type: RustMinimal,
@@ -17,7 +18,7 @@ struct RustMinimal {
 }
 
 impl kernel::Module for RustMinimal {
-    fn init(_module: &'static ThisModule) -> Result<Self> {
+    fn init(_name: &'static CStr, _module: &'static ThisModule) -> Result<Self> {
         pr_info!("Rust minimal sample (init)\n");
         pr_info!("Am I built-in? {}\n", !cfg!(MODULE));
 

samples/rust/rust_print.rs

@@ -40,7 +40,7 @@ fn arc_print() -> Result {
 }
 
 impl kernel::Module for RustPrint {
-    fn init(_module: &'static ThisModule) -> Result<Self> {
+    fn init(_name: &'static CStr, _module: &'static ThisModule) -> Result<Self> {
         pr_info!("Rust printing macros sample (init)\n");
 
         pr_emerg!("Emergency message (level 0) without args\n");