remove the unneeded bts_link pointer from msgb

include/osmocore/msgb.h

@@ -23,14 +23,9 @@
 #include <stdint.h>
 #include "linuxlist.h"
 
-struct bts_link;
-
 struct msgb {
 	struct llist_head list;
 
-	/* ptr to the physical E1 link to the BTS(s) */
-	struct gsm_bts_link *bts_link;
-
 	/* Part of which TRX logical channel we were received / transmitted */
 	struct gsm_bts_trx *trx;
 	struct gsm_lchan *lchan;

src/msgb.c

@@ -80,7 +80,6 @@ void msgb_reset(struct msgb *msg)
 	msg->head = msg->_data;
 	msg->tail = msg->_data;
 
-	msg->bts_link = NULL;
 	msg->trx = NULL;
 	msg->lchan = NULL;
 	msg->l2h = NULL;