Drop pointless @_ match pattern bindings

In a match arm, instead of binding the matched value to the name "_",
just don't bind. Its shorter and easier to understand

Found by clippy lint redundant_patter:
https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern

1 files changed, 1 insertions, 1 deletions

diff --git a/net/src/wkd.rs b/net/src/wkd.rs
index 6662567a..7d3df2d9 100644
--- a/net/src/wkd.rs
+++ b/net/src/wkd.rs
@@ -400,7 +400,7 @@ pub fn insert<P, S, V>(base_path: P, domain: S, variant: V,
         .open(well_known.expect("at least one address").join("policy"))
     {
         Err(ref e) if e.kind() == std::io::ErrorKind::AlreadyExists => (),
-        r @ _ => drop(r?),
+        r => drop(r?),
     }
 
     Ok(())