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SubjectRe: [PATCH 4.19 09/78] iio: adc: mcp3422: fix locking on error path

> [ Upstream commit a139ffa40f0c24b753838b8ef3dcf6ad10eb7854 ]
> Reading from the chip should be unlocked on error path else the lock
> could never being released.
> Fixes: 07914c84ba30 ("iio: adc: Add driver for Microchip MCP3422/3/4 high resolution ADC")
> Fixes: 3f1093d83d71 ("iio: adc: mcp3422: fix locking scope")

Well, 3f1093d83d71 is only applied later in the stable series, so this
introduces spurious unlock.

Ideally this should go just after 3f1093d83d71 ("iio: adc: mcp3422:
fix locking scope").

Best regards,
(cesky, pictures)
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