refactor(http1): simplify match of Token parse error

Author: seanmonstar

src/proto/h1/role.rs

@@ -188,20 +188,16 @@ impl Http1Transaction for Server {
                     headers_len = req.headers.len();
                 }
                 Ok(httparse::Status::Partial) => return Ok(None),
-                Err(err) => {
-                    return Err(match err {
-                        // if invalid Token, try to determine if for method or path
-                        httparse::Error::Token => {
-                            if req.method.is_none() {
-                                Parse::Method
-                            } else {
-                                debug_assert!(req.path.is_none());
-                                Parse::Uri
-                            }
-                        }
-                        other => other.into(),
-                    });
-                }
+                // if invalid Token, try to determine if for method or path
+                Err(httparse::Error::Token) => return Err({
+                    if req.method.is_none() {
+                        Parse::Method
+                    } else {
+                        debug_assert!(req.path.is_none());
+                        Parse::Uri
+                    }
+                }),
+                Err(err) => return Err(err.into()),
             }
         };