misc: Address compiler warning on unused variables

abis_nm.c: In function ‘abis_nm_get_attr’:
abis_nm.c:1380:11: warning: unused variable ‘cur’ [-Wunused-variable]

abis_nm.c: In function ‘ipac_parse_bcch_info’:
abis_nm.c:2588:11: warning: variable ‘len’ set but not used [-Wunused-but-set-variable]

bts_nokia_site.c:1310:6: warning: variable ‘constructed’ set but not used [-Wunused-but-set-variable]
bts_nokia_site.c: At top level:
bts_nokia_site.c:1364:12: warning: ‘dump_elements’ defined but not used [-Wunused-function]

gsm_04_08.c: In function ‘mm_rx_loc_upd_req’:
gsm_04_08.c:521:6: warning: variable ‘rc’ set but not used [-Wunused-but-set-variable]

osmo_msc.c: In function ‘msc_ciph_m_compl’:
osmo_msc.c:122:7: warning: variable ‘rc’ set but not used [-Wunused-but-set-variable]

bts_hsl_femtocell.c: In function ‘hslfemto_bootstrap_om’:
bts_hsl_femtocell.c:101:11: warning: variable ‘cur’ set but not used [-Wunused-but-set-variable]

bts_hsl_femtocell.c: In function ‘hsl_drop_oml’:
bts_hsl_femtocell.c:232:21: warning: variable ‘line’ set but not used [-Wunused-but-set-variable]

handover_logic.c: In function ‘ho_chan_activ_ack’:
handover_logic.c:197:6: warning: variable ‘rc’ set but not used [-Wunused-but-set-variable]
diff --git a/openbsc/src/libbsc/bts_hsl_femtocell.c b/openbsc/src/libbsc/bts_hsl_femtocell.c
index ebab34a..2187245 100644
--- a/openbsc/src/libbsc/bts_hsl_femtocell.c
+++ b/openbsc/src/libbsc/bts_hsl_femtocell.c
@@ -98,23 +98,22 @@
 static int hslfemto_bootstrap_om(struct gsm_bts *bts)
 {
 	struct msgb *msg;
-	uint8_t *cur;
 
 	msg = hsl_alloc_msgb();
-	cur = msgb_put(msg, sizeof(l1_msg));
+	msgb_put(msg, sizeof(l1_msg));
 	memcpy(msg->data, l1_msg, sizeof(l1_msg));
 	msg->dst = bts->c0->rsl_link;
 	abis_rsl_sendmsg(msg);
 
 #if 1
 	msg = hsl_alloc_msgb();
-	cur = msgb_put(msg, sizeof(conn_trau_msg));
+	msgb_put(msg, sizeof(conn_trau_msg));
 	memcpy(msg->data, conn_trau_msg, sizeof(conn_trau_msg));
 	msg->dst = bts->c0->rsl_link;
 	abis_rsl_sendmsg(msg);
 #endif
 	msg = hsl_alloc_msgb();
-	cur = msgb_put(msg, sizeof(conn_trau_msg2));
+	msgb_put(msg, sizeof(conn_trau_msg2));
 	memcpy(msg->data, conn_trau_msg2, sizeof(conn_trau_msg2));
 	msg->dst = bts->c0->rsl_link;
 	abis_rsl_sendmsg(msg);
@@ -123,7 +122,7 @@
 	oml_arfcn_bsic[13] = bts->bsic;
 
 	msg = hsl_alloc_msgb();
-	cur = msgb_put(msg, sizeof(oml_arfcn_bsic));
+	msgb_put(msg, sizeof(oml_arfcn_bsic));
 	memcpy(msg->data, oml_arfcn_bsic, sizeof(oml_arfcn_bsic));
 	msg->dst = bts->c0->rsl_link;
 	abis_sendmsg(msg);
@@ -229,12 +228,9 @@
 
 void hsl_drop_oml(struct gsm_bts *bts)
 {
-	struct e1inp_line *line;
-
 	if (!bts->oml_link)
 		return;
 
-	line = bts->oml_link->ts->line;
 	e1inp_sign_link_destroy(bts->oml_link);
 	bts->oml_link = NULL;