lib-ssl-iostream: Fix boolean misuse in SSL_CTX_set_ecdh_auto usage

f8aaa6e63a56085f61f128838ad7a3aa080d9d5b introduced warnings on gcc

diff --git a/src/lib-ssl-iostream/iostream-openssl-context.c b/src/lib-ssl-iostream/iostream-openssl-context.c
index 6dbbe9676073f50f21a78ba5096b58725383fd4a..e3c902e18da4c1e5f38e7ccd2210590d8772b587 100644 (file)
--- a/src/lib-ssl-iostream/iostream-openssl-context.c
+++ b/src/lib-ssl-iostream/iostream-openssl-context.c
@@ -526,7 +526,7 @@ ssl_proxy_ctx_set_crypto_params(SSL_CTX *ssl_ctx,
        /* OpenSSL >= 1.0.2 automatically handles ECDH temporary key parameter
           selection. The return value of this function changes is changed to
           bool in OpenSSL 1.1 and is int in OpenSSL 1.0.2+ */
-       if (!(bool)SSL_CTX_set_ecdh_auto(ssl_ctx, 1)) {
+       if ((long)(SSL_CTX_set_ecdh_auto(ssl_ctx, 1)) == 0) {
                /* shouldn't happen */
                *error_r = t_strdup_printf("SSL_CTX_set_ecdh_auto() failed: %s",
                                           openssl_iostream_error());