[librsvg] document: make function private

[Paolo Borelli <pborelli src gnome org>]

commit 3f1e076f6a31b2e18fce2590d940efd2207b7a61
Author: Paolo Borelli <pborelli gnome org>
Date:   Sat Apr 4 23:09:36 2020 +0200

    document: make function private

 rsvg_internals/src/document.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/rsvg_internals/src/document.rs b/rsvg_internals/src/document.rs
index 26f24ecb..2d8cf50f 100644
--- a/rsvg_internals/src/document.rs
+++ b/rsvg_internals/src/document.rs
@@ -289,7 +289,7 @@ impl<'i> AcquiredNodes<'i> {
         }
     }
 
-    pub fn lookup_node(
+    fn lookup_node(
         &self,
         fragment: &Fragment,
         element_types: &[ElementType],