Silently ignoring a stale global SSL error left after disabled renegotiation.

src/event/ngx_event_openssl.c

diff --git a/src/event/ngx_event_openssl.c b/src/event/ngx_event_openssl.c
index 9f64ea2..8293690 100644
--- a/src/event/ngx_event_openssl.c
+++ b/src/event/ngx_event_openssl.c
@@ -863,6 +863,13 @@
 
         ngx_log_error(NGX_LOG_NOTICE, c->log, 0, "SSL renegotiation disabled");
 
+        while (ERR_peek_error()) {
+            ngx_ssl_error(NGX_LOG_DEBUG, c->log, 0,
+                          "ignoring stale global SSL error");
+        }
+
+        ERR_clear_error();
+
         c->ssl->no_wait_shutdown = 1;
         c->ssl->no_send_shutdown = 1;