fix "proxy_pass https://..." broken in r1427

src/event/ngx_event_openssl.c

diff --git a/src/event/ngx_event_openssl.c b/src/event/ngx_event_openssl.c
index c7a2e94..029d7db 100644
--- a/src/event/ngx_event_openssl.c
+++ b/src/event/ngx_event_openssl.c
@@ -674,6 +674,11 @@
         }
 
         if (bytes) {
+
+            if (n == 0 || n == NGX_ERROR) {
+                c->read->ready = 1;
+            }
+
             return bytes;
         }