The test seemingly ensures that this code block is hit only once.
However, if we enable later activation of MMEs, it will be hit a second
(and third, ...) time. The only thing in guards against, though, is an
INIT message to the L1L2 thread, when register_enb_pending == 0, which
should only be sent once.  Therefore, functionality won't be changed if
register_enb_pending becomes negative, and the assert can be removed.

Develop integration 2020 week 26

See merge request oai/openairinterface5g!841

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Merge remote-tracking branch 'origin/NR_RRC_X2AP_RemoveHardcodings_GlobalEdge' into develop_integration_2020_w26

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Conflicts:
	openair2/LAYER2/NR_MAC_gNB/gNB_scheduler.c

Develop integration 2020 week 25

The following Merge Requests have been included:

* MR 799 : NR RRC PRACH procedures
* MR 831 : NR PUCCH2 polar implementation
* MR 832 : coarse scope cleanup
* MR 835 : fix NR UE transport on PBCH
* MR 836 : NR fix phytest packet corruption DLSCH

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Merge remote-tracking branch 'origin/nr_fix_phytest_packet_corruption_dlsch' into develop_integration_2020_w25