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/handover_logic.c b/openbsc/src/libbsc/handover_logic.c
index 711c260..5ce3301 100644
--- a/openbsc/src/libbsc/handover_logic.c
+++ b/openbsc/src/libbsc/handover_logic.c
@@ -194,7 +194,6 @@
 static int ho_chan_activ_ack(struct gsm_lchan *new_lchan)
 {
 	struct bsc_handover *ho;
-	int rc;
 
 	/* we need to check if this channel activation is related to
 	 * a handover at all (and if, which particular handover) */
@@ -207,7 +206,7 @@
 	/* we can now send the 04.08 HANDOVER COMMAND to the MS
 	 * using the old lchan */
 
-	rc = gsm48_send_ho_cmd(ho->old_lchan, new_lchan, 0, ho->ho_ref);
+	gsm48_send_ho_cmd(ho->old_lchan, new_lchan, 0, ho->ho_ref);
 
 	/* start T3103.  We can continue either with T3103 expiration,
 	 * 04.08 HANDOVER COMPLETE or 04.08 HANDOVER FAIL */