We currently ignore ret of the nandc partition parser if unprotected
spare data is true. This is the case for ipq806x nand.
Backport patch that fix this error and correctly handle error from
partition parser.
Fixes: ae6a63bc97 ("ipq806x: 5.15: replace nandc patch with upstream version")
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
