ASoC: adi: Add missing return statement.

The probe routine was disabling the clock even
if the system was configured successfully.  Add
a return statement to leave clocks enabled.

Signed-off-by: Andrew Jackson <Andrew.Jackson@arm.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@kernel.org>