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Christian Kellner authored
Introduce a new BoltIdent struct that holds the name and vendor information for a thunderbolt device together with a reference to the 'struct udev_device' that provides those information. This binds the lifetime of the char pointers directly to the struct where they are contained and thus prevent accidental bugs where the strings are used after the udev_device is not valid anymore (got un-referenced). Since the struct holds a reference, define a clear method for it and the corresponding auto-cleanup method. Use the new BoltIdent struct for 'bolt_device_ident'. Re-factor it to not use a loop anymore. The read_sysattr_name helper, use in 'bolt_device_ident' now uses the recently introduced sysattr value getter.
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