HID LampArray: stop on a failed report descriptor read

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hid_get_report_descriptor returns -1 on failure and the length was
stored unsigned, so the descriptor walk ran past the end of the stack
buffer. Windows reconstructs the descriptor from preparsed data and can
fail where Linux returns the kernel's copy. A failed read now leaves the
device with no lamps, the same as a descriptor with missing reports.

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500 Internal Server Error

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