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 <gridish@freescale.com>
Cc: Jerry Huang <Chang-Ming.Huang@freescale.com>
Cc: Peter Barada <peterb@logicpd.com>
Cc: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20200706133341.476881-31-lee.jones@linaro.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/fhci-tds.c

@@ -467,17 +467,15 @@ u32 fhci_host_transaction(struct fhci_usb *usb,
 /* 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)
@@ -524,7 +522,6 @@ void fhci_flush_actual_frame(struct fhci_usb *usb)
 {
 	u8 mode;
 	u16 tb_ptr;
-	u16 extra_data;
 	u16 td_status;
 	u32 buf_ptr;
 	struct usb_td __iomem *td;
@@ -538,7 +535,7 @@ void fhci_flush_actual_frame(struct fhci_usb *usb)
 	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);
@@ -552,7 +549,7 @@ void fhci_flush_actual_frame(struct fhci_usb *usb)
 		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);