usb: usbfs: stop using compat_alloc_user_space

Just switch the low-level routines to take kernel structures, and do the
conversion from the compat to the native structure on that.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20200722073655.220011-1-hch@lst.de


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>