ASoC: Return -1 instead of -EINVAL to ensure consistency

The code can't really cope with I/O errors, so it would be better
to be consistent throughout all cache functions and return -1 instead
of -EINVAL.

The return value of snd_soc_read(...) is mostly checked in the probe
function and nowhere else.

Signed-off-by: Dimitris Papastamos <[email protected]>
Acked-by: Liam Girdwood <[email protected]>
Signed-off-by: Mark Brown <[email protected]>

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