fix: Do not duplicate ctx expr in check_call_opt_key!

(cherry picked from commit 86ddc63a573cd08ec19008448ec2fca33a84159e)

rust/nix-expr/src/eval_state.rs

@@ -223,9 +223,9 @@ impl EvalState {
             .with_context(|| "require_attrs_select_opt: attrName contains null byte")?;
         let v2 = unsafe {
             check_call_opt_key!(raw::get_attr_byname[
-                self.context,
+                &mut self.context,
                 v.raw_ptr(),
-                self.raw_ptr(),
+                self.eval_state.as_ptr(),
                 attr_name.as_ptr()
             ])
         }?;