spi: Get rid of spi_add_lock
iio:cfaxi_adc: Fix typo

s/lenght/length/g

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
iio:axi_dds: Fix typo

s/lenght/length/g

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>