src: remove unnecessary return statement

I think the code would be a little clearer if the return statement
was removed here since End() does not return any value and neither
does ParseHeader.

PR-URL: #13094
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>

src/node_crypto_clienthello.cc

@@ -119,7 +119,7 @@ void ClientHelloParser::ParseHeader(const uint8_t* data, size_t avail) {
   return;
 
  fail:
-  return End();
+  End();
 }