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commit 23fd537c upstream.

Always unmap all SG entries as required by DMA API

Fixes: a698908d

 ("usb: gadget: add generic map/unmap request utilities")
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>