LTE_CryptoFunctions: Fix rx_count increment

The previous logic was wrong, since it was increasing the rx_count at
the time where the msg is received and before checking it. Instead, it
should be increased after having validated and accepted it.
This fixes the case where rx_count will have to be reset (to zero) when
doing mobility GERAN->EUTRAN.

Change-Id: I712d95f7784a6a9855fe36300b0ebfcd4c6ef377
1 file changed