3a3dc5b5b4
Usbhid's hid_report_size() calculates integral size of all reports of given kind found in the HID descriptor rather then exact size of report with given ID as its userland counterpart does. As all input data processed by the driver is located within the same report, calculate required driver's buffer size with userland version, imported in one of the previous commits. This allows us to skip zeroing of buffer on processing of each report. While here do some minor refactoring. MFC after: 2 weeks
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