[librsvg: 6/9] Minor cleanup: use .ok() instead of if-let

[Federico Mena Quintero <federico src gnome org>]

commit cb67d213199dee9996f382c99e9f568c4ae7dbd8
Author: John Ledbetter <john ledbetter gmail com>
Date:   Mon May 24 09:37:21 2021 -0400

    Minor cleanup: use .ok() instead of if-let
    
    These two constructs are equivalent when converting a Result to an
    Option, so let's use the shorter built-in.

 src/filter_func.rs | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)
---
diff --git a/src/filter_func.rs b/src/filter_func.rs
index c13d486a..a50484cc 100644
--- a/src/filter_func.rs
+++ b/src/filter_func.rs
@@ -123,11 +123,7 @@ where
 // about that.
 #[allow(clippy::unnecessary_wraps)]
 fn parse_blur<'i>(parser: &mut Parser<'i, '_>) -> Result<FilterFunction, ParseError<'i>> {
-    let length = if let Ok(length) = parser.try_parse(|p| Length::parse(p)) {
-        Some(length)
-    } else {
-        None
-    };
+    let length = parser.try_parse(|p| Length::parse(p)).ok();
 
     Ok(FilterFunction::Blur(Blur {
         std_deviation: length,