Devices under /sys/firmware/ do not have subsystems. Hence, the validation in sd_device_new_from_subsystem_sysname() -> device_new_from_path_join() always failed. Fixes a bug introduced by cd7c71154cd62d3f50c07ce387edd9c20aebd7bc (v257). Fixes #35861. (cherry picked from commit 3328d1e1816f408e6516c35991a89a8d21fd60b4)
System and Service Manager
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