gprs: Rename gprs_subscr_delete to gprs_subscr_cleanup

The old name is somewhat misleading. The function is rather preparing
the subscriber for a subsequent subscr_free, that is possibly invoked
by a subscr_put. It detaches the subscriber from the MM context and
optionally invokes a PURGE_MS procedure. Therefore the _cleanup
suffix is chosen (see mm_ctx_cleanup_free).

Sponsored-by: On-Waves ehf
diff --git a/openbsc/src/gprs/gprs_subscriber.c b/openbsc/src/gprs/gprs_subscriber.c
index b7e6af4..ee6c477 100644
--- a/openbsc/src/gprs/gprs_subscriber.c
+++ b/openbsc/src/gprs/gprs_subscriber.c
@@ -127,7 +127,7 @@
 	return subscr_active_by_imsi(NULL, imsi);
 }
 
-void gprs_subscr_delete(struct gsm_subscriber *subscr)
+void gprs_subscr_cleanup(struct gsm_subscriber *subscr)
 {
 	if (subscr->sgsn_data->mm) {
 		subscr_put(subscr->sgsn_data->mm->subscr);
@@ -150,7 +150,7 @@
 	subscr->flags &= ~GPRS_SUBSCRIBER_ENABLE_PURGE;
 
 	gprs_subscr_update(subscr);
-	gprs_subscr_delete(subscr);
+	gprs_subscr_cleanup(subscr);
 }
 
 static int gprs_subscr_tx_gsup_message(struct gsm_subscriber *subscr,