tools/iio: Add memory allocation failure check for trigger_name

[ Upstream commit 3c6b818b ]

Added a check to handle memory allocation failure for `trigger_name`
and return `-ENOMEM`.

Signed-off-by: Zhu Jun <zhujun2@cmss.chinamobile.com>
Link: https://patch.msgid.link/20240828093129.3040-1-zhujun2@cmss.chinamobile.com


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>