staging:iio: core. Allow for event chrdev obtaining ioctl if no buffer present.
Logic bug meant the chrdev would fail to open if there was no buffer support in a driver or in the core. This meant the ioctl to get the event chrdev would fail and hence events were not available. V2: change error to -EINVAL to mark as unsuitable for reading rather than not there. Both are true depending on how you look at it. Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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