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

If the IP address for X2AP is not good, the error message reported
was very unclear. Attempt to make it better.

This commit manually reverts the commits:
- 97c69dc4
- 3278aa49

The basic simulator was not functional anymore because
the UE did not send RRCConnectionSetupComplete due to
some problem in the PDCP layer, most probably.

This break was there and went away, for whatever reason...

The bug popped up when one UE was doing TCP UL iperf and a second UE
attempted to connect. A crash of the eNB happened because we changed
the wrong NFAPI structure in a TTI where both UEs are scheduled.

Something like that.

SCTP: one to many sockets implementation

Fix: RAN API: remove_ul_slice() frees ul sched_name pointer, when sched_name set, free it when resetting

Commit 7823858e2d11e8cabc1ca7bf7f507b9a050942d3 introduced this as a comment.

The comparison in AssertFatal was not correct,
taking the opposite meaning to the one expected.

Affects:
* store_dlsch_buffer()
* assign_rbs_required()