release UE Contexts on SCTP_RESTART

When receiving SCTP_RESTART for a given HNB, directly clear the UE
Contexts.

(The HNB typically connects via HNBAP shortly after this causing a UE
Context clearing too, but UE state should always be cleared on
SCTP_RESTART, no matter what.)

Change-Id: I583922193ba73e17ab85152005535188c2762b85
---
M src/osmo-hnbgw/hnbgw.c
1 file changed, 17 insertions(+), 0 deletions(-)

diff --git a/src/osmo-hnbgw/hnbgw.c b/src/osmo-hnbgw/hnbgw.c
index 5b4e9b6..0624803 100644
--- a/src/osmo-hnbgw/hnbgw.c
+++ b/src/osmo-hnbgw/hnbgw.c
@@ -264,6 +264,7 @@
 			case SCTP_RESTART:
 				LOGHNB(hnb, DMAIN, LOGL_NOTICE, "HNB SCTP conn RESTARTed, marking as HNBAP-unregistered\n");
 				hnb->hnb_registered = false;
+				hnb_context_release_ue_state(hnb);
 				/* The tx queue may be quite full after an SCTP RESTART: (SYS#6113)
 				 * The link may have been flaky (a possible reason for the peer restarting the conn) and
 				 * hence the kernel socket Tx queue may be full (no ACKs coming back) and our own userspace

