Disambiguate two warning messages

Part-of: <https://gitlab.gnome.org/GNOME/librsvg/-/merge_requests/988>

Author: federicomenaquintero

rsvg/src/drawing_ctx.rs

@@ -1753,8 +1753,8 @@ impl DrawingCtx {
         let _self_acquired = match acquired_nodes.acquire_ref(node) {
             Ok(n) => n,
 
-            Err(AcquireError::CircularReference(_)) => {
-                rsvg_log!(self.session, "circular reference in element {}", node);
+            Err(AcquireError::CircularReference(circular)) => {
+                rsvg_log!(self.session, "circular reference in element {}", circular);
                 return Ok(self.empty_bbox());
             }
 
@@ -1764,8 +1764,8 @@ impl DrawingCtx {
         let acquired = match acquired_nodes.acquire(link) {
             Ok(acquired) => acquired,
 
-            Err(AcquireError::CircularReference(node)) => {
-                rsvg_log!(self.session, "circular reference in element {}", node);
+            Err(AcquireError::CircularReference(circular)) => {
+                rsvg_log!(self.session, "circular reference from {} to element {}", node, circular);
                 return Ok(self.empty_bbox());
             }