usb: gadget: udc: core: don't starve DMA resources
Always unmap all SG entries as required by DMA API Fixes: a698908d ("usb: gadget: add generic map/unmap request utilities") Cc: <stable@vger.kernel.org> # v3.4+ Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
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