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sctp_proxy: Allow handling EXIT signal

The gen_statem in sctp_proxy.erl has code to handle EXIT signal of
children in connected() state, but it lacks enabling receival of the
EXIT signal. gen_statem don't have the trap enabled by default.

Change-Id: I3dcad7450be8883736eb6f2ea1460add3b83e01b
---
M src/sctp_proxy.erl
1 file changed, 1 insertion(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/erlang/osmo-s1gw refs/changes/21/37921/1

diff --git a/src/sctp_proxy.erl b/src/sctp_proxy.erl
index 1d8d305..3ebabbd 100644
--- a/src/sctp_proxy.erl
+++ b/src/sctp_proxy.erl
@@ -75,6 +75,7 @@
 %% ------------------------------------------------------------------
 
 init([Aid, MmeAddr, MmePort]) ->
+    process_flag(trap_exit, true),
     {ok, connecting,
      #{enb_aid => Aid,
        mme_addr => MmeAddr,

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