tools:iio: return values directly

Return directly, if no common cleanup is required.

Signed-off-by: Hartmut Knaack <knaack.h@gmx.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --cc tools/iio/generic_buffer.c
Simple merge

diff --cc tools/iio/iio_event_monitor.c
Simple merge

diff --cc tools/iio/iio_utils.c
Simple merge