usb: Fix USB keyboard polling via control endpoint
USB keyboard polling failed for some keyboards on PowerPC 5020. This was caused by requesting only 4 bytes of data from keyboards that produce an 8 byte HID report. Signed-off-by: NAdrian Cox <adrian@humboldt.co.uk> Signed-off-by: NWolfgang Denk <wd@denx.de> Cc: Marek Vasut <marex@denx.de>
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