[librsvg/rustification] path_parser.rs: Simplify optional_comma_whitespace()

[Federico Mena Quintero <federico src gnome org>]

commit 1490d99061422ce66fee7dd20204570c18a60d5e
Author: Federico Mena Quintero <federico gnome org>
Date:   Mon Nov 7 14:22:13 2016 -0600

    path_parser.rs: Simplify optional_comma_whitespace()

 rust/src/path_parser.rs |    8 +++-----
 1 files changed, 3 insertions(+), 5 deletions(-)
---
diff --git a/rust/src/path_parser.rs b/rust/src/path_parser.rs
index 1207795..81ee1ad 100644
--- a/rust/src/path_parser.rs
+++ b/rust/src/path_parser.rs
@@ -128,11 +128,9 @@ impl<'external> PathParser<'external> {
 
     fn optional_comma_whitespace (&mut self) -> bool {
         assert! (self.optional_whitespace ());
-        if self.match_char (',') {
-            self.optional_whitespace ()
-        } else {
-            true
-        }
+        self.match_char (',');
+        assert! (self.optional_whitespace ());
+        true
     }
 
     fn lookahead_is (&self, c: char) -> bool {