V555 The expression '(curpos - bufpos) > 0' will work as 'curpos != bufpos'.

Change-Id: I432c10c9c5ecc99293ec3f03f6e1a660e1c47e28
Reviewed-on: https://gerrit.libreoffice.org/63236
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>