[librsvg/librsvg-2.50] Refactor set_style_attribute()

[Federico Mena Quintero <federico src gnome org>]

commit 62288dbd23a1e2ea5c1930e6b3b98fa04e3c11ce
Author: Federico Mena Quintero <federico gnome org>
Date:   Fri Feb 12 10:26:55 2021 -0600

    Refactor set_style_attribute()

 rsvg_internals/src/element.rs | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)
---
diff --git a/rsvg_internals/src/element.rs b/rsvg_internals/src/element.rs
index 20f467ea..583aaef1 100644
--- a/rsvg_internals/src/element.rs
+++ b/rsvg_internals/src/element.rs
@@ -275,18 +275,20 @@ impl<T: SetAttributes + Draw> ElementInner<T> {
 
     /// Applies CSS styles from the saved value of the "style" attribute
     fn set_style_attribute(&mut self) {
-        if !self.style_attr.is_empty() {
+        let style = &self.style_attr;
+
+        if !style.is_empty() {
             if let Err(e) = self.specified_values.parse_style_declarations(
-                self.style_attr.as_str(),
+                style,
                 Origin::Author,
                 &mut self.important_styles,
             ) {
                 self.set_error(e);
             }
-
-            self.style_attr.clear();
-            self.style_attr.shrink_to_fit();
         }
+
+        self.style_attr.clear();
+        self.style_attr.shrink_to_fit();
     }
 
     fn set_error(&mut self, error: ElementError) {