gsup_server: Log error if epdg_ue_fsm:auth_request() fails

Change-Id: Iea5cc5736d8de9d652c15d9bc12ab16833c1ae7b
---
M src/gsup_server.erl
1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/gsup_server.erl b/src/gsup_server.erl
index 5c536fc..0c7a723 100644
--- a/src/gsup_server.erl
+++ b/src/gsup_server.erl
@@ -235,7 +235,8 @@
 	{UE, State1} = find_or_new_gsups_ue(Imsi, State0),
 	case epdg_ue_fsm:auth_request(UE#gsups_ue.pid) of
 	ok -> ok;
-	{error, _} ->
+	{error, Err} ->
+		lager:error("Auth Req for Imsi ~p failed: ~p~n", [Imsi, Err]),
 		Resp = #{message_type => send_auth_info_err,
 			 imsi => Imsi,
 			 message_class => 5,

