usb: core: devices: remove dead code under #ifdef PROC_EXTRA

usb_dump_hub_descriptor() and usb_dump_string() are defined under #ifdef
PROC_EXTRA (while PROC_EXTRA doesn't seem to have ever been #define'd)
since the dawn of the git era -- remove this dead code at last...
Signed-off-by: Sergey Shtylyov <s.shtylyov@omp.ru>

Link: https://lore.kernel.org/r/ec08915b-faf2-2f0b-dfb1-048dfa2c67f3@omp.ruSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/core/devices.c

@@ -390,41 +390,6 @@ static char *usb_dump_desc(char *start, char *end, struct usb_device *dev)
 	return start;
 }
 
-
-#ifdef PROC_EXTRA /* TBD: may want to add this code later */
-
-static char *usb_dump_hub_descriptor(char *start, char *end,
-				     const struct usb_hub_descriptor *desc)
-{
-	int leng = USB_DT_HUB_NONVAR_SIZE;
-	unsigned char *ptr = (unsigned char *)desc;
-
-	if (start > end)
-		return start;
-	start += sprintf(start, "Interface:");
-	while (leng && start <= end) {
-		start += sprintf(start, " %02x", *ptr);
-		ptr++; leng--;
-	}
-	*start++ = '\n';
-	return start;
-}
-
-static char *usb_dump_string(char *start, char *end,
-			     const struct usb_device *dev, char *id, int index)
-{
-	if (start > end)
-		return start;
-	start += sprintf(start, "Interface:");
-	if (index <= dev->maxstring && dev->stringindex &&
-	    dev->stringindex[index])
-		start += sprintf(start, "%s: %.100s ", id,
-				 dev->stringindex[index]);
-	return start;
-}
-
-#endif /* PROC_EXTRA */
-
 /*****************************************************************/
 
 /* This is a recursive function. Parameters: