[librsvg: 24/32] Use ok_or_else like clippy says

[Federico Mena Quintero <federico src gnome org>]

commit 172f339acac8943c5809cecb756e5bb62b665e46
Author: Federico Mena Quintero <federico gnome org>
Date:   Mon Nov 30 12:42:35 2020 -0600

    Use ok_or_else like clippy says

 src/c_api/pixbuf_utils.rs | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)
---
diff --git a/src/c_api/pixbuf_utils.rs b/src/c_api/pixbuf_utils.rs
index 4d9b30a1..73433a74 100644
--- a/src/c_api/pixbuf_utils.rs
+++ b/src/c_api/pixbuf_utils.rs
@@ -23,9 +23,8 @@ use crate::{
 fn pixbuf_new(width: i32, height: i32) -> Result<Pixbuf, RenderingError> {
     assert!(width > 0 && height > 0);
 
-    Pixbuf::new(Colorspace::Rgb, true, 8, width, height).ok_or(RenderingError::OutOfMemory(
-        String::from("creating a Pixbuf"),
-    ))
+    Pixbuf::new(Colorspace::Rgb, true, 8, width, height)
+        .ok_or_else(|| RenderingError::OutOfMemory(String::from("creating a Pixbuf")))
 }
 
 pub fn empty_pixbuf() -> Result<Pixbuf, RenderingError> {