usb: host: fhci-tds: Remove unused variables 'buf' and 'extra_data'

Neither have been used since the driver's inception in 2009.

Fixes the following W=1 kernel build warning(s):

drivers/usb/host/fhci-tds.c: In function ‘fhci_flush_bds’:
drivers/usb/host/fhci-tds.c:472:6: warning: variable ‘buf’ set but not used [-Wunused-but-set-variable]
472 | u32 buf;
| ^~~
drivers/usb/host/fhci-tds.c:470:6: warning: variable ‘extra_data’ set but not used [-Wunused-but-set-variable]
470 | u16 extra_data;
| ^~~~~~~~~~
drivers/usb/host/fhci-tds.c: In function ‘fhci_flush_actual_frame’:
drivers/usb/host/fhci-tds.c:527:6: warning: variable ‘extra_data’ set but not used [-Wunused-but-set-variable]
527 | u16 extra_data;
| ^~~~~~~~~~

Cc: Shlomi Gridish <[e-mail]>
Cc: Jerry Huang <[e-mail]>
Cc: Peter Barada <[e-mail]>
Cc: Anton Vorontsov <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/host/fhci-tds.c

···
 /* Reset the Tx BD ring */
 void fhci_flush_bds(struct fhci_usb *usb)
 {
-	u16 extra_data;
 	u16 td_status;
-	u32 buf;
 	struct usb_td __iomem *td;
 	struct endpoint *ep = usb->ep0;
 
 	td = ep->td_base;
 	while (1) {
 		td_status = in_be16(&td->status);
-		buf = in_be32(&td->buf_ptr);
-		extra_data = in_be16(&td->extra);
+		in_be32(&td->buf_ptr);
+		in_be16(&td->extra);
 
 		/* if the TD is not empty - we'll confirm it as Timeout */
 		if (td_status & TD_R)
···
 {
 	u8 mode;
 	u16 tb_ptr;
-	u16 extra_data;
 	u16 td_status;
 	u32 buf_ptr;
 	struct usb_td __iomem *td;
···
 	td = cpm_muram_addr(tb_ptr);
 	td_status = in_be16(&td->status);
 	buf_ptr = in_be32(&td->buf_ptr);
-	extra_data = in_be16(&td->extra);
+	in_be16(&td->extra);
 	do {
 		if (td_status & TD_R) {
 			out_be16(&td->status, (td_status & ~TD_R) | TD_TO);
···
 		td = next_bd(ep->td_base, td, td_status);
 		td_status = in_be16(&td->status);
 		buf_ptr = in_be32(&td->buf_ptr);
-		extra_data = in_be16(&td->extra);
+		in_be16(&td->extra);
 	} while ((td_status & TD_R) || buf_ptr);
 
 	fhci_td_transaction_confirm(usb);