iio: dln2: Check return value of devm_iio_trigger_register()

iio: dln2: Check return value of devm_iio_trigger_register()

commit 390961c4ccb991938892f553abcfba4915776e2e upstream.

Registering a trigger can fail and the return value of
devm_iio_trigger_register() must be checked. Otherwise undefined behavior
can occur when the trigger is used.

Fixes: 04c353627d67 ("iio: adc: Add support for DLN2 ADC")
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Link: https://lore.kernel.org/r/20211101133043.6974-1-lars@metafoo.de
Cc: <stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>