libcaer: only update ROI sizes if ROI updates came in from the device.
libcaer: only update ROI sizes if ROI updates came in from the device.


git-svn-id: 89fac2d401b69a6bd84fd03b77c0c5b4bc96d236@7714 b7f4320f-462c-0410-a916-d9f35bb82d52

inilabs/libcaer,inilabs/libcaer,inilabs/libcaer,inilabs/libcaer