optimize: add error checking for SSL_set_tlsext_status_type().

Author: Fahnenfluchtige

src/ngx_stream_lua_socket_tcp.c

@@ -1793,8 +1793,12 @@ ngx_stream_lua_socket_tcp_sslhandshake(lua_State *L)
                 if (n >= 5) {
                     if (lua_toboolean(L, 5)) {
 #ifdef NGX_STREAM_LUA_USE_OCSP
-                        SSL_set_tlsext_status_type(c->ssl->connection,
-                                                   TLSEXT_STATUSTYPE_ocsp);
+                        if (SSL_set_tlsext_status_type(c->ssl->connection,
+                            TLSEXT_STATUSTYPE_ocsp) != 1)
+                        {
+                            return luaL_error(L,
+                                              "failed to enable OCSP stapling");
+                        }
 #else
                         return luaL_error(L, "no OCSP support");
 #endif