staging: iio: ring_sw: Fix incorrect test on successful read of last value, causes infinite loop
This is a bad one. The test means that almost no reads of the last value ever succeed! Result is an infinite loop. Another one for the 'oops' category. Signed-off-by: NJonathan Cameron <jic23@cam.ac.uk> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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