Merge of r4652: ssl without buffer should not set c->buffered.

Removed mistaken setting of NGX_SSL_BUFFERED flag in ngx_ssl_send_chain()
if SSL buffer is not used.

src/event/ngx_event_openssl.c

@@ -990,7 +990,6 @@ ngx_ssl_send_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit)
             }
 
             if (n == NGX_AGAIN) {
-                c->buffered |= NGX_SSL_BUFFERED;
                 return in;
             }