commit aac7d69207fa08c0114625fbfb35a11d88a0cace
Author: dormando <dormando@rydia.net>
Date:   Mon Mar 16 19:46:12 2020 -0700

    tls: handle accept errors properly
    
    0 return from accept is also an error. pointed out by @tharanga on
    review.

diff --git a/memcached.c b/memcached.c
index be93474..b9ce8b1 100644
--- a/memcached.c
+++ b/memcached.c
@@ -7021,7 +7021,7 @@ static void drive_machine(conn *c) {
                     }
                     SSL_set_fd(ssl, sfd);
                     int ret = SSL_accept(ssl);
-                    if (ret < 0) {
+                    if (ret <= 0) {
                         int err = SSL_get_error(ssl, ret);
                         if (err == SSL_ERROR_SYSCALL || err == SSL_ERROR_SSL) {
                             if (settings.verbose) {