[librsvg: 7/27] Clarify variable name

[Federico Mena Quintero <federico src gnome org>]

commit 215e8ede3df0dd57e11229589230495452ce4f45
Author: Federico Mena Quintero <federico gnome org>
Date:   Thu Mar 4 19:23:11 2021 -0600

    Clarify variable name
    
    We already have a node_name, but node_id didn't refer to that same
    node; it refers to the mask, so use mask_id.

 src/drawing_ctx.rs | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/src/drawing_ctx.rs b/src/drawing_ctx.rs
index d41a6fdf..8502eddb 100644
--- a/src/drawing_ctx.rs
+++ b/src/drawing_ctx.rs
@@ -715,8 +715,8 @@ impl DrawingCtx {
 
                 // Mask
 
-                if let Some(node_id) = mask {
-                    if let Ok(acquired) = acquired_nodes.acquire(node_id) {
+                if let Some(mask_id) = mask {
+                    if let Ok(acquired) = acquired_nodes.acquire(mask_id) {
                         let mask_node = acquired.get();
 
                         match *mask_node.borrow_element() {
@@ -747,7 +747,7 @@ impl DrawingCtx {
                                 rsvg_log!(
                                     "element {} references \"{}\" which is not a mask",
                                     node_name,
-                                    node_id
+                                    mask_id
                                 );
                             }
                         }
@@ -755,7 +755,7 @@ impl DrawingCtx {
                         rsvg_log!(
                             "element {} references nonexistent mask \"{}\"",
                             node_name,
-                            node_id
+                            mask_id
                         );
                     }
                 } else {