[nginx] SSL: fixed incorrect usage of #if instead of #ifdef.

[Sergey Kandaurov]

details:   https://hg.nginx.org/nginx/rev/0ce2d7a520be
branches:  
changeset: 8065:0ce2d7a520be
user:      Maxim Dounin <mdounin at mdounin.ru>
date:      Wed Sep 07 00:44:10 2022 +0300
description:
SSL: fixed incorrect usage of #if instead of #ifdef.

In 2014ed60f17f, "#if SSL_CTRL_SET_ECDH_AUTO" test was incorrectly used
instead of "#ifdef SSL_CTRL_SET_ECDH_AUTO".  There is no practical
difference, since SSL_CTRL_SET_ECDH_AUTO evaluates to a non-zero numeric
value when defined, but anyway it's better to correctly test if the value
is defined.

diffstat:

 src/event/ngx_event_openssl.c |  2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diffs (12 lines):

diff -r 5f5a34e83ca2 -r 0ce2d7a520be src/event/ngx_event_openssl.c
--- a/src/event/ngx_event_openssl.c	Wed Sep 07 00:43:51 2022 +0300
+++ b/src/event/ngx_event_openssl.c	Wed Sep 07 00:44:10 2022 +0300
@@ -1426,7 +1426,7 @@ ngx_ssl_ecdh_curve(ngx_conf_t *cf, ngx_s
 
     SSL_CTX_set_options(ssl->ctx, SSL_OP_SINGLE_ECDH_USE);
 
-#if SSL_CTRL_SET_ECDH_AUTO
+#ifdef SSL_CTRL_SET_ECDH_AUTO
     /* not needed in OpenSSL 1.1.0+ */
     SSL_CTX_set_ecdh_auto(ssl->ctx, 1);
 #endif