usb: gadget: change len to size_t on alloc_ep_req()
Length of buffers should be of type size_t whenever possible. Altough recommended, this change has no real practical change, unless a driver has a uses a huge or negative buffer size - it might help find these bugs. Signed-off-by: NFelipe F. Tonello <eu@felipetonello.com> Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>
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