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btusb_bulk_out() reads the EPOUT buffer in multiple of 4 bytes because of Quark's USB FIFO size limitation. But this has later been taken care internally in the DW driver making it redundant in hci_usb. Remove Quark specific handling and read the whole EPOUT buffer at once. Signed-off-by: Sundar Subramaniyan <sundar.subramaniyan@gmail.com>