samples: rust: platform: remove trailing commas

This prepares for a later commit in which we introduce a custom
formatting macro; that macro doesn't handle trailing commas so just
remove them.

Acked-by: Danilo Krummrich <dakr@kernel.org>
Reviewed-by: Benno Lossin <lossin@kernel.org>
Signed-off-by: Tamir Duberstein <tamird@gmail.com>
Link: https://patch.msgid.link/20251018-cstr-core-v18-1-9378a54385f8@gmail.com
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

Author: tamird

samples/rust/rust_driver_platform.rs

@@ -146,7 +146,7 @@ impl SampleDriver {
 
         let name = c_str!("test,u32-optional-prop");
         let prop = fwnode.property_read::<u32>(name).or(0x12);
-        dev_info!(dev, "'{name}'='{prop:#x}' (default = 0x12)\n",);
+        dev_info!(dev, "'{name}'='{prop:#x}' (default = 0x12)\n");
 
         // A missing required property will print an error. Discard the error to
         // prevent properties_parse from failing in that case.
@@ -161,7 +161,7 @@ impl SampleDriver {
         let prop: [i16; 4] = fwnode.property_read(name).required_by(dev)?;
         dev_info!(dev, "'{name}'='{prop:?}'\n");
         let len = fwnode.property_count_elem::<u16>(name)?;
-        dev_info!(dev, "'{name}' length is {len}\n",);
+        dev_info!(dev, "'{name}' length is {len}\n");
 
         let name = c_str!("test,i16-array");
         let prop: KVec<i16> = fwnode.property_read_array_vec(name, 4)?.required_by(dev)?;