usb: plusb: remove unused pl_clear_QuickLink_features function

clang with W=1 reports
drivers/net/usb/plusb.c:65:1: error:
unused function 'pl_clear_QuickLink_features' [-Werror,-Wunused-function]
pl_clear_QuickLink_features(struct usbnet *dev, int val)
^
This static function is not used, so remove it.

Signed-off-by: Tom Rix <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/usb/plusb.c

···
 }
 
 static inline int
-pl_clear_QuickLink_features(struct usbnet *dev, int val)
-{
-	return pl_vendor_req(dev, 1, (u8) val, 0);
-}
-
-static inline int
 pl_set_QuickLink_features(struct usbnet *dev, int val)
 {
 	return pl_vendor_req(dev, 3, (u8) val, 0);