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Return NO_DOCS after last ADF page, not IO_ERROR

Earle F. Philhower, III requested to merge earlephilhower/backends:mb2100_adf_oop into master

When scanning from ADF in MP150 based scanners, after the last page is scanned the XML session-close was sent. However, when using the ADF, if the frontend called sane_start/sane_read(), it would try and send an XML command that was not valid after the session abort. This would give an IO error up through the stack.

Now, check if ADF scanning is happening and on reads after the last page return SANE_STATUS_NO_DOCS on read. and abort.

Finally, minor fix of max DPI for Pixma MAXIFY MB21xx/27xx to 1200 DPI.

Edited by Earle F. Philhower, III

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