ran_peer: Move rx_reset_ack logic into its own func

Later on we want to do extra steps upon receiving a Rx Reset Ack
(checking for Osmux support from peer). Let's move handling of this
message into its own function to have handling implementation in one
place.

Change-Id: I516c4baf6071d26f6c530726d93677bed968efd1
diff --git a/src/libmsc/ran_peer.c b/src/libmsc/ran_peer.c
index 40e26a2..35f2842 100644
--- a/src/libmsc/ran_peer.c
+++ b/src/libmsc/ran_peer.c
@@ -152,6 +152,11 @@
 	ran_peer_state_chg(rp, RAN_PEER_ST_READY);
 }
 
+static void ran_peer_rx_reset_ack(struct ran_peer *rp)
+{
+	ran_peer_state_chg(rp, RAN_PEER_ST_READY);
+}
+
 void ran_peer_reset(struct ran_peer *rp)
 {
 	struct msgb *reset;
@@ -269,7 +274,7 @@
 	switch (event) {
 
 	case RAN_PEER_EV_RX_RESET_ACK:
-		ran_peer_state_chg(rp, RAN_PEER_ST_READY);
+		ran_peer_rx_reset_ack(rp);
 		return;
 
 	case RAN_PEER_EV_MSG_UP_CO: