rust: Apply suggested fixes from clippy

Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>

rust/pvimg/src/cmd/test.rs

@@ -2,7 +2,7 @@
 //
 // Copyright IBM Corp. 2024
 
-use std::path::{Path, PathBuf};
+use std::path::Path;
 
 use anyhow::Result;
 use log::{info, warn};
@@ -27,7 +27,7 @@ fn hdr_test_target_hashes(hdr: &SeHdr, key_hashes: &Path) -> Result<bool> {
             ref source,
         } if matches!(ty, FileAccessErrorType::Open)
             && source.kind() == std::io::ErrorKind::NotFound
-            && *path == PathBuf::from(UvKeyHashesV1::SYS_UV_KEYS_ALL) =>
+            && path == Path::new(UvKeyHashesV1::SYS_UV_KEYS_ALL) =>
         {
             Error::UnavailableQueryUvKeyHashesSupport { source: err }
         }

rust/pvimg/src/pv_utils/se_hdr/brb.rs

@@ -140,6 +140,7 @@ pub trait SeHdrPubBuilderTrait {
     fn set_pcf(&mut self, pcf: &PlaintextControlFlagsV1) -> Result<()>;
 }
 
+#[allow(dead_code)]
 #[enum_dispatch(SeHdrData)]
 pub trait SeHdrConfBuilderTrait {
     fn generate_cck(&self) -> Result<SymKey>;

rust/pvimg/src/pv_utils/uv_keys.rs

@@ -18,6 +18,7 @@ trait UvKeyHashTrait: AsRef<[u8]> {}
 #[derive(Debug, PartialEq, Eq)]
 pub struct UvKeyHashV1([u8; 32]);
 
+#[allow(dead_code)]
 #[non_exhaustive]
 #[enum_dispatch]
 #[derive(PartialEq, Eq, Debug)]