USB: g_file_storage: fix bug in DMA buffer handling

This patch (as963) fixes a recently-introduced bug.  The gadget
conversion removing DMA-mapped buffer allocation did not remove quite
enough code from the g_file_storage driver; DMA pointers were being
set to 0.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/gadget/file_storage.c

@@ -599,7 +599,6 @@ enum fsg_buffer_state {
 
 struct fsg_buffhd {
 	void				*buf;
-	dma_addr_t			dma;
 	enum fsg_buffer_state		state;
 	struct fsg_buffhd		*next;
 
@@ -2612,7 +2611,6 @@ static int send_status(struct fsg_dev *fsg)
 
 		fsg->intr_buffhd = bh;		// Point to the right buffhd
 		fsg->intreq->buf = bh->inreq->buf;
-		fsg->intreq->dma = bh->inreq->dma;
 		fsg->intreq->context = bh;
 		start_transfer(fsg, fsg->intr_in, fsg->intreq,
 				&fsg->intreq_busy, &bh->state);
@@ -3201,7 +3199,6 @@ static int do_set_interface(struct fsg_dev *fsg, int altsetting)
 		if ((rc = alloc_request(fsg, fsg->bulk_out, &bh->outreq)) != 0)
 			goto reset;
 		bh->inreq->buf = bh->outreq->buf = bh->buf;
-		bh->inreq->dma = bh->outreq->dma = bh->dma;
 		bh->inreq->context = bh->outreq->context = bh;
 		bh->inreq->complete = bulk_in_complete;
 		bh->outreq->complete = bulk_out_complete;