`pcmk__node_attr_target()` may return its argument, but crm_attribute.c frees it before using it.
Regression introduced in 2.1.0 by 15f5c2901
See:
* [[https://issues.redhat.com/browse/RHEL-23065 | RHEL-23065]] (RHEL 8)
* [[https://issues.redhat.com/browse/RHEL-23498 | RHEL-23498]] (RHEL 9)