regmap: debugfs: Fix seeking from the cache
We don't want to bomb out early if we failed to get the cache any more,
just soldier on instead and we won't get confused and always return the
first block.
Reported-by: Philipp Zabel <p.zabel@pengutronix.de
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
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