clippy fixes

src/material/mod.rs

@@ -223,8 +223,7 @@ impl PatchMaterial {
             _ => {
                 return Err(VdfError::from(UnknownError::from(
                     "included vdf doesn't look like a material",
-                ))
-                .into())
+                )))
             }
         };
         for (key, value) in self.replace.iter() {