iio: imu: kmx61: Enhance error handling
This fixes parts of kmx61 error handling to make code easier to read and to be more consistent with IIO coding conventions: * prefer as single point for error handling instead of duplicating code for each function * directly return a value from a case branch instead of breaking * fix error message for writing REG_CTRL1 Also, add separate error paths for kmx61_trigger_setup/iio_triggered_buffer_setup calls. Signed-off-by: NDaniel Baluta <daniel.baluta@intel.com> Signed-off-by: NJonathan Cameron <jic23@kernel.org>
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