regulator: tps65910: Fix a memory leak in tps65910_probe error path

Fix a memory leak if chip id is not matched.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>