[libsoup] soup-auth-digest: Fix buffer size issue found by Coverity Scan and clang

[Milan Crha <mcrha src gnome org>]

commit 2d4efd22ae39d862978ed1434286fe66d8577fa5
Author: Milan Crha <mcrha redhat com>
Date:   Mon Jun 25 16:15:41 2018 +0200

    soup-auth-digest: Fix buffer size issue found by Coverity Scan and clang
    
    https://bugzilla.gnome.org/show_bug.cgi?id=781771

 libsoup/soup-auth-digest.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/libsoup/soup-auth-digest.c b/libsoup/soup-auth-digest.c
index eda2a93c..e8ba9903 100644
--- a/libsoup/soup-auth-digest.c
+++ b/libsoup/soup-auth-digest.c
@@ -343,7 +343,7 @@ soup_auth_digest_compute_response (const char        *method,
        g_checksum_update (checksum, (guchar *)method, strlen (method));
        g_checksum_update (checksum, (guchar *)":", 1);
        g_checksum_update (checksum, (guchar *)uri, strlen (uri));
-       strncpy (hex_a2, g_checksum_get_string (checksum), 33);
+       memcpy (hex_a2, g_checksum_get_string (checksum), sizeof (char) * 33);
        g_checksum_free (checksum);
 
        /* compute KD */
@@ -369,7 +369,7 @@ soup_auth_digest_compute_response (const char        *method,
        }
 
        g_checksum_update (checksum, (guchar *)hex_a2, 32);
-       strncpy (response, g_checksum_get_string (checksum), 33);
+       memcpy (response, g_checksum_get_string (checksum), sizeof (char) * 33);
        g_checksum_free (checksum);
 }