[glib-networking] openssl: Fix warning on Linux

[Xavier Claessens <xclaesse src gnome org>]

commit 7857dc1d25229dbbf449849e791a399c2fed241a
Author: Nirbheek Chauhan <nirbheek centricular com>
Date:   Wed Feb 20 22:16:18 2019 +0530

    openssl: Fix warning on Linux
    
    warning: passing argument 2 of ‘d2i_OCSP_RESPONSE’ from incompatible pointer type 
[-Wincompatible-pointer-types]
       resp = d2i_OCSP_RESPONSE (NULL, &p, len);
    
    SSL_get_tlsext_status_ocsp_resp() expects it to not be const and
    causes a warning on MSVC if we make it always const, but
    d2i_OCSP_RESPONSE() wants it to be const because it won't modify it.
    
    https://gitlab.gnome.org/GNOME/glib-networking/merge_requests/23#note_441785

 tls/openssl/gtlsconnection-openssl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/tls/openssl/gtlsconnection-openssl.c b/tls/openssl/gtlsconnection-openssl.c
index 81fdf04..c6df559 100644
--- a/tls/openssl/gtlsconnection-openssl.c
+++ b/tls/openssl/gtlsconnection-openssl.c
@@ -296,7 +296,7 @@ verify_ocsp_response (GTlsConnectionOpenssl *openssl,
   if (p == NULL)
     return 0;
 
-  resp = d2i_OCSP_RESPONSE (NULL, &p, len);
+  resp = d2i_OCSP_RESPONSE (NULL, (const unsigned char **) &p, len);
   if (resp == NULL)
     return G_TLS_CERTIFICATE_GENERIC_ERROR;