hack in RLC AM to avoid a race
Here is the problem: UE comes. SRB2 is configured via message to RRC. At some point the RLC AM is created but not configured yet. At this moment (I think) MAC calls mac_rlc_status_ind which calls this function. But the init was not finished yet and we have a crash below when testing mem_block != NULL. The "solution" is to test if rlc->input_sdus is NULL. This is a very dirty hack. I would say the solution is to use proper locking mechanism because RLC is used by two threads: PHY/MAC on one hand and RRC on another hand (I think).
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