samples: rust: i2c: replace kernel::c_str! with C-Strings

C-String literals were added in Rust 1.77. Replace instances of
`kernel::c_str!` with C-String literals where possible.

Signed-off-by: Tamir Duberstein <tamird@gmail.com>
Acked-by: Igor Korotin <igor.korotin.linux@gmail.com>
Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com>
Link: https://patch.msgid.link/20251222-cstr-i2c-v1-2-df1c258d4615@gmail.com
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

Author: tamird

samples/rust/rust_driver_i2c.rs

@@ -4,7 +4,6 @@
 
 use kernel::{
     acpi,
-    c_str,
     device::Core,
     i2c,
     of,
@@ -17,21 +16,21 @@ kernel::acpi_device_table! {
     ACPI_TABLE,
     MODULE_ACPI_TABLE,
     <SampleDriver as i2c::Driver>::IdInfo,
-    [(acpi::DeviceId::new(c_str!("LNUXBEEF")), 0)]
+    [(acpi::DeviceId::new(c"LNUXBEEF"), 0)]
 }
 
 kernel::i2c_device_table! {
     I2C_TABLE,
     MODULE_I2C_TABLE,
     <SampleDriver as i2c::Driver>::IdInfo,
-    [(i2c::DeviceId::new(c_str!("rust_driver_i2c")), 0)]
+    [(i2c::DeviceId::new(c"rust_driver_i2c"), 0)]
 }
 
 kernel::of_device_table! {
     OF_TABLE,
     MODULE_OF_TABLE,
     <SampleDriver as i2c::Driver>::IdInfo,
-    [(of::DeviceId::new(c_str!("test,rust_driver_i2c")), 0)]
+    [(of::DeviceId::new(c"test,rust_driver_i2c"), 0)]
 }
 
 impl i2c::Driver for SampleDriver {

samples/rust/rust_i2c_client.rs

@@ -69,7 +69,6 @@
 
 use kernel::{
     acpi,
-    c_str,
     device,
     devres::Devres,
     i2c,
@@ -90,20 +89,20 @@ kernel::of_device_table!(
     OF_TABLE,
     MODULE_OF_TABLE,
     <SampleDriver as platform::Driver>::IdInfo,
-    [(of::DeviceId::new(c_str!("test,rust-device")), ())]
+    [(of::DeviceId::new(c"test,rust-device"), ())]
 );
 
 kernel::acpi_device_table!(
     ACPI_TABLE,
     MODULE_ACPI_TABLE,
     <SampleDriver as platform::Driver>::IdInfo,
-    [(acpi::DeviceId::new(c_str!("LNUXBEEF")), ())]
+    [(acpi::DeviceId::new(c"LNUXBEEF"), ())]
 );
 
 const SAMPLE_I2C_CLIENT_ADDR: u16 = 0x30;
 const SAMPLE_I2C_ADAPTER_INDEX: i32 = 0;
 const BOARD_INFO: i2c::I2cBoardInfo =
-    i2c::I2cBoardInfo::new(c_str!("rust_driver_i2c"), SAMPLE_I2C_CLIENT_ADDR);
+    i2c::I2cBoardInfo::new(c"rust_driver_i2c", SAMPLE_I2C_CLIENT_ADDR);
 
 impl platform::Driver for SampleDriver {
     type IdInfo = ();