dmaengine: usb-dmac: remove unused ‘uchan’

In usb_dmac_of_xlate(), variable ‘uchan’ is initialized but never used, which
leads to warning with W=1

drivers/dma/sh/usb-dmac.c: In function ‘usb_dmac_of_xlate’:
drivers/dma/sh/usb-dmac.c:655:24: warning: variable ‘uchan’ set but not used [-Wunused-but-set-variable]
struct usb_dmac_chan *uchan;

So remove it.

Cc: Yoshihiro Shimoda <[e-mail]>
Signed-off-by: Vinod Koul <[e-mail]>

drivers/dma/sh/usb-dmac.c

···
 static struct dma_chan *usb_dmac_of_xlate(struct of_phandle_args *dma_spec,
 					  struct of_dma *ofdma)
 {
-	struct usb_dmac_chan *uchan;
 	struct dma_chan *chan;
 	dma_cap_mask_t mask;
 
···
 	chan = dma_request_channel(mask, usb_dmac_chan_filter, dma_spec);
 	if (!chan)
 		return NULL;
-
-	uchan = to_usb_dmac_chan(chan);
 
 	return chan;
 }