hsr: remove get_prp_lan_id()

get_prp_lan_id() has never been used.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/hsr/hsr_main.h

@@ -259,11 +259,6 @@ static inline u16 prp_get_skb_sequence_nr(struct prp_rct *rct)
 	return ntohs(rct->sequence_nr);
 }
 
-static inline u16 get_prp_lan_id(struct prp_rct *rct)
-{
-	return ntohs(rct->lan_id_and_LSDU_size) >> 12;
-}
-
 /* assume there is a valid rct */
 static inline bool prp_check_lsdu_size(struct sk_buff *skb,
 				       struct prp_rct *rct,