fix "fix gcc inline assembler operands usage"

Change-Id: I192c30bed60a657e9360bbe1d6dd217c75ed8da6
Reviewed-on: https://gerrit.libreoffice.org/8209
Tested-by: Michael Stahl <mstahl@redhat.com>
Reviewed-by: Michael Stahl <mstahl@redhat.com>