detected with GCC 13 [-Werror=enum-int-mismatch]

Solves Issue #1096.

Signed-off-by: Claudio Fontana <cfontana@suse.de>
Cc: Pavel Dovgalyuk <pavel.dovgalyuk@ispras.ru>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20220704075832.31537-1-cfontana@suse.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>