Fix S1AP error indication message sent from MME not handled in eNB
When MME sends S1AP Error Indication message to OAI eNB, it is not handled and assertion occurrs with message "Unknown procedure ID (15) for initiating message" displayed.
Add handler in function s1ap_eNB_decode_initiating_message() of s1ap_eNB_decoder.c to fix it.
Edited by Bi-Ruei, Chiu