[gtk-vnc] ard: set connection error

[Daniel P. Berrange <dberrange src gnome org>]

commit 5e4bfa3ab6e5309d6bd6b2b7852f267ccf1e8a02
Author: Jakub Janků <jjanku redhat com>
Date:   Wed May 5 22:31:12 2021 +0200

    ard: set connection error
    
    As with vncEncryptBytes2 in the earlier patch,
    the connection error must be set, otherwise the connection
    stays in the mainloop, but nothing is happening.
    
    Signed-off-by: Jakub Janků <jjanku redhat com>

 src/vncconnection.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/vncconnection.c b/src/vncconnection.c
index 5271274..cb59fa9 100644
--- a/src/vncconnection.c
+++ b/src/vncconnection.c
@@ -4242,6 +4242,8 @@ cleanup_mem:
     free(key);
 
     if (gcry_err_code(error) != GPG_ERR_NO_ERROR) {
+        vnc_connection_set_error(conn, "Unknown authentication failure: %s",
+                                 gcry_strerror(error));
         return FALSE;
     }