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usb: dwc3: gadget: Account for link TRB in TRBs left
The TRBs left calculation didn't account for the link TRB taking up one spot. If the trb_dequeue < trb_enqueue, then the result includes the link TRB slot so it must be adjusted. Signed-off-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
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