[librsvg/librsvg-2.46] handle: use is_none

[Federico Mena Quintero <federico src gnome org>]

commit b4fb1d024a0e80a2037cce05009812efaaad12b8
Author: Paolo Borelli <pborelli gnome org>
Date:   Sun Oct 13 12:14:18 2019 +0200

    handle: use is_none

 rsvg_internals/src/handle.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/rsvg_internals/src/handle.rs b/rsvg_internals/src/handle.rs
index 6eeff69f..42bf513d 100644
--- a/rsvg_internals/src/handle.rs
+++ b/rsvg_internals/src/handle.rs
@@ -254,7 +254,7 @@ impl Handle {
         size_callback: &SizeCallback,
         is_testing: bool,
     ) -> Result<RsvgPositionData, RenderingError> {
-        if let None = id {
+        if id.is_none() {
             return Ok(RsvgPositionData { x: 0, y: 0 });
         }