scripts/qemu-ga-client: Fix exception handling

Fixes: 50d189c

These error classes aren't available anymore. Fix the bitrot.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-id: 20210604155532.1499282-4-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
1 file changed