More clippy lint fixes

libclamav_rust/src/cdiff.rs

@@ -578,6 +578,10 @@ pub fn script2cdiff(script_file_name: &str, builder: &str, server: &str) -> Resu
 
 /// C interface for cdiff_apply() (below).
 /// This function is for use in sigtool.c and libfreshclam_internal.c
+///
+/// # Safety
+///
+/// No parameters may be NULL.
 #[export_name = "cdiff_apply"]
 pub unsafe extern "C" fn _cdiff_apply(
     cdiff_file_path_str: *const c_char,

libclamav_rust/src/codesign.rs

@@ -225,7 +225,7 @@ where
             }
         }
 
-        let mut writer = std::io::BufWriter::new(options.open(&signature_file_path)?);
+        let mut writer = std::io::BufWriter::new(options.open(signature_file_path)?);
 
         if !signature_file_path.exists() || !append {
             writer.write_all(b"#clamsign-1.0\n")?;