src: use namespace prefix osmo_signal*

Summary of changes:

s/signal_cbfn/osmo_signal_cbfn/g
s/register_signal_handler/osmo_signal_register_handler/g
s/unregister_signal_handler/osmo_signal_unregister_handler/g
s/dispatch_signal/osmo_signal_dispatch/g
diff --git a/openbsc/src/libbsc/abis_nm.c b/openbsc/src/libbsc/abis_nm.c
index 0007816..6ca45f7 100644
--- a/openbsc/src/libbsc/abis_nm.c
+++ b/openbsc/src/libbsc/abis_nm.c
@@ -701,7 +701,7 @@
 	nsd.old_state = nm_state;
 	nsd.new_state = &new_state;
 	nsd.obj_inst = obj_inst;
-	dispatch_signal(SS_NM, S_NM_STATECHG_ADM, &nsd);
+	osmo_signal_dispatch(SS_NM, S_NM_STATECHG_ADM, &nsd);
 
 	nm_state->administrative = adm_state;
 
@@ -760,7 +760,7 @@
 		nsd.new_state = &new_state;
 		nsd.obj_inst = &foh->obj_inst;
 		nsd.bts = bts;
-		dispatch_signal(SS_NM, S_NM_STATECHG_OPER, &nsd);
+		osmo_signal_dispatch(SS_NM, S_NM_STATECHG_OPER, &nsd);
 		nm_state->operational = new_state.operational;
 		nm_state->availability = new_state.availability;
 		if (nm_state->administrative == 0)
@@ -827,15 +827,15 @@
 		break;
 	case NM_MT_SW_ACTIVATED_REP:
 		DEBUGPC(DNM, "Software Activated Report\n");
-		dispatch_signal(SS_NM, S_NM_SW_ACTIV_REP, mb);
+		osmo_signal_dispatch(SS_NM, S_NM_SW_ACTIV_REP, mb);
 		break;
 	case NM_MT_FAILURE_EVENT_REP:
 		rx_fail_evt_rep(mb);
-		dispatch_signal(SS_NM, S_NM_FAIL_REP, mb);
+		osmo_signal_dispatch(SS_NM, S_NM_FAIL_REP, mb);
 		break;
 	case NM_MT_TEST_REP:
 		DEBUGPC(DNM, "Test Report\n");
-		dispatch_signal(SS_NM, S_NM_TEST_REP, mb);
+		osmo_signal_dispatch(SS_NM, S_NM_TEST_REP, mb);
 		break;
 	default:
 		DEBUGPC(DNM, "reporting NM MT 0x%02x\n", mt);
@@ -1043,7 +1043,7 @@
 
 		nack_data.msg = mb;
 		nack_data.mt = mt;
-		dispatch_signal(SS_NM, S_NM_NACK, &nack_data);
+		osmo_signal_dispatch(SS_NM, S_NM_NACK, &nack_data);
 		abis_nm_queue_send_next(mb->trx->bts);
 		return 0;
 	}
@@ -1078,10 +1078,10 @@
 		DEBUGP(DNM, "CONN MDROP LINK ACK\n");
 		break;
 	case NM_MT_IPACC_RESTART_ACK:
-		dispatch_signal(SS_NM, S_NM_IPACC_RESTART_ACK, NULL);
+		osmo_signal_dispatch(SS_NM, S_NM_IPACC_RESTART_ACK, NULL);
 		break;
 	case NM_MT_IPACC_RESTART_NACK:
-		dispatch_signal(SS_NM, S_NM_IPACC_RESTART_NACK, NULL);
+		osmo_signal_dispatch(SS_NM, S_NM_IPACC_RESTART_NACK, NULL);
 		break;
 	case NM_MT_SET_BTS_ATTR_ACK:
 		/* The HSL wants an OPSTART _after_ the SI has been set */
@@ -2884,12 +2884,12 @@
 	case NM_MT_IPACC_GET_NVATTR_NACK:
 		signal.trx = gsm_bts_trx_by_nr(msg->trx->bts, foh->obj_inst.trx_nr);
 		signal.msg_type = foh->msg_type;
-		dispatch_signal(SS_NM, S_NM_IPACC_NACK, &signal);
+		osmo_signal_dispatch(SS_NM, S_NM_IPACC_NACK, &signal);
 		break;
 	case NM_MT_IPACC_SET_NVATTR_ACK:
 		signal.trx = gsm_bts_trx_by_nr(msg->trx->bts, foh->obj_inst.trx_nr);
 		signal.msg_type = foh->msg_type;
-		dispatch_signal(SS_NM, S_NM_IPACC_ACK, &signal);
+		osmo_signal_dispatch(SS_NM, S_NM_IPACC_ACK, &signal);
 		break;
 	default:
 		break;