usb: dwc2: remove set but unused variable

This patch removes a set but unused variable in hcd.c.

Fixes gcc warning:
variable ‘data_fifo’ set but not used [-Wunused-but-set-variable]
Acked-by: Minas Harutyunyan <hminas@synopsys.com>
Signed-off-by: Joshua Abraham <j.abraham1776@gmail.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/dwc2/hcd.c

@@ -1328,14 +1328,11 @@ static void dwc2_hc_write_packet(struct dwc2_hsotg *hsotg,
 	u32 remaining_count;
 	u32 byte_count;
 	u32 dword_count;
-	u32 __iomem *data_fifo;
 	u32 *data_buf = (u32 *)chan->xfer_buf;
 
 	if (dbg_hc(chan))
 		dev_vdbg(hsotg->dev, "%s()\n", __func__);
 
-	data_fifo = (u32 __iomem *)(hsotg->regs + HCFIFO(chan->hc_num));
-
 	remaining_count = chan->xfer_len - chan->xfer_count;
 	if (remaining_count > chan->max_packet)
 		byte_count = chan->max_packet;