iio: accel: bma180: Fix indio_dev->trig assignment
This can result in wrong reference count for trigger device, call iio_trigger_get to increment reference. Refer to http://www.spinics.net/lists/linux-iio/msg13669.html for discussion with Jonathan. Signed-off-by:Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by:
Jonathan Cameron <jic23@kernel.org> Cc: Stable@vger.kernel.org
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