[Backport v3.5-branch] drivers: adc: lmp90xxx: fix checksum mismatch return value #75383
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During channel reads, zero is returned on CRC mismatches: the returned error variable is not written to after a previous non-zero check. Return -EIO to mirror other drivers' checksum validation behaviors. Signed-off-by: Jared Kangas <kangas.jd@gmail.com> (cherry picked from commit 8ec3c04)
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Backport 8ec3c04 from #75206.
Fixes: #75373