src: use namespace prefix osmo_counter*

Summary of changes:

s/struct counter/struct osmo_counter/g
s/counter_inc/osmo_counter_inc/g
s/counter_get/osmo_counter_get/g
s/counter_reset/osmo_counter_reset/g
s/counter_alloc/osmo_counter_alloc/g
s/counter_free/osmo_counter_free
diff --git a/openbsc/src/libmsc/gsm_04_11.c b/openbsc/src/libmsc/gsm_04_11.c
index 326c2b8..5069be7 100644
--- a/openbsc/src/libmsc/gsm_04_11.c
+++ b/openbsc/src/libmsc/gsm_04_11.c
@@ -560,7 +560,7 @@
 	uint8_t address_lv[12]; /* according to 03.40 / 9.1.2.5 */
 	int rc = 0;
 
-	counter_inc(conn->bts->network->stats.sms.submitted);
+	osmo_counter_inc(conn->bts->network->stats.sms.submitted);
 
 	gsms = sms_alloc();
 	if (!gsms)
@@ -656,7 +656,7 @@
 	gsms->receiver = subscr_get_by_extension(conn->bts->network, gsms->dest_addr);
 	if (!gsms->receiver) {
 		rc = 1; /* cause 1: unknown subscriber */
-		counter_inc(conn->bts->network->stats.sms.no_receiver);
+		osmo_counter_inc(conn->bts->network->stats.sms.no_receiver);
 		goto out;
 	}
 
@@ -846,10 +846,10 @@
 		 * to store this in our database and wait for a SMMA message */
 		/* FIXME */
 		send_signal(S_SMS_MEM_EXCEEDED, trans, sms, 0);
-		counter_inc(net->stats.sms.rp_err_mem);
+		osmo_counter_inc(net->stats.sms.rp_err_mem);
 	} else {
 		send_signal(S_SMS_UNKNOWN_ERROR, trans, sms, 0);
-		counter_inc(net->stats.sms.rp_err_other);
+		osmo_counter_inc(net->stats.sms.rp_err_other);
 	}
 
 	sms_free(sms);
@@ -1139,7 +1139,7 @@
 
 	DEBUGP(DSMS, "TX: SMS DELIVER\n");
 
-	counter_inc(conn->bts->network->stats.sms.delivered);
+	osmo_counter_inc(conn->bts->network->stats.sms.delivered);
 	db_sms_inc_deliver_attempts(trans->sms.sms);
 
 	return gsm411_rp_sendmsg(msg, trans, GSM411_MT_RP_DATA_MT, msg_ref);