vnc-tls: Clean up dead store in vnc_set_x509_credential()

Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

ui/vnc-tls.c

@@ -444,8 +444,6 @@ static int vnc_set_x509_credential(VncDisplay *vd,
     struct stat sb;
 
     g_free(*cred);
-    *cred = NULL;
-
     *cred = g_malloc(strlen(certdir) + strlen(filename) + 2);
 
     strcpy(*cred, certdir);