If an attribute is read but the value is not used (i.e. ret_value is NULL), then sd_device_get_sysattr_value() mistakenly frees the read data even though it is cached internally. Fixes a bug introduced by acfc2a1d15560084e077ffb3be472cd117e9020a. Fixes #25702. (cherry picked from commit eb18e7b7825e8320bb4d6269690ef8c3f5461d2b)
System and Service Manager
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