[librsvg] filters: shorten context code

[Paolo Borelli <pborelli src gnome org>]

commit fde742246a2acd7bc7aa6aefc7633bf858807c04
Author: Paolo Borelli <pborelli gnome org>
Date:   Wed Dec 11 20:09:29 2019 +0100

    filters: shorten context code

 rsvg_internals/src/filters/context.rs | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)
---
diff --git a/rsvg_internals/src/filters/context.rs b/rsvg_internals/src/filters/context.rs
index e3719198..a10b3074 100644
--- a/rsvg_internals/src/filters/context.rs
+++ b/rsvg_internals/src/filters/context.rs
@@ -242,12 +242,6 @@ impl FilterContext {
             .map_err(FilterError::CairoError)
     }
 
-    /// Returns the output of the filter primitive by its result name.
-    #[inline]
-    pub fn filter_output(&self, name: &str) -> Option<&FilterOutput> {
-        self.previous_results.get(name)
-    }
-
     /// Converts this `FilterContext` into the surface corresponding to the output of the filter
     /// chain.
     ///
@@ -399,7 +393,8 @@ impl FilterContext {
                 .map(FilterInput::StandardInput),
 
             Input::FilterOutput(ref name) => self
-                .filter_output(name)
+                .previous_results
+                .get(name)
                 .cloned()
                 .map(FilterInput::PrimitiveOutput)
                 .ok_or(FilterError::InvalidInput),