Remove redundant pointer check in SSL engine.

asio/include/asio/ssl/detail/impl/engine.ipp

diff --git a/asio/include/asio/ssl/detail/impl/engine.ipp b/asio/include/asio/ssl/detail/impl/engine.ipp
index 5504411..2e4a39d 100644
--- a/asio/include/asio/ssl/detail/impl/engine.ipp
+++ b/asio/include/asio/ssl/detail/impl/engine.ipp
@@ -206,7 +206,7 @@
 
   // SSL v2 doesn't provide a protocol-level shutdown, so an eof on the
   // underlying transport is passed through.
-  if (ssl_ && ssl_->version == SSL2_VERSION)
+  if (ssl_->version == SSL2_VERSION)
     return ec;
 
   // Otherwise, the peer should have negotiated a proper shutdown.