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backend/avision: fix lock-up of scanners not supporting fastfeed

Michael Niewöhner requested to merge c0d3z3r0/sane-backends:for-upstream/avision_fix_fastfeed into release/1.0.31

de19ebc6 introduced a regression, where some scanners would lock-up completely and require a full power cycle.

To fix that, do not call release_unit for any scanners not supporting fastfeed for now, since that leads to lock-ups on at least one device. Currently, it isn't clear what exactly is causing the problems, so it maybe be enabled in a correct way again, later.

Resolves issue #337 (closed).

Signed-off-by: Michael Niewöhner foss@mniewoehner.de

Edited by Olaf Meeuwissen

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