Fix: relayd: `!vsession->current_trace_chunk` assertion failed

Fix: relayd: `!vsession->current_trace_chunk` assertion failed

Observed issue
==============

When performing:

  #!/bin/bash

  lttng create py_syscalls --live

  lttng enable-event -u -a
  lttng enable-event -k -a

  lttng start

  babeltrace2 -i lttng-live net://localhost/host/raton/py_syscalls

The relay daemon hits this assertion:

  Thread 8 (Thread 0x7fffeeffd700 (LWP 167040) "lttng-relayd"):
  #0  0x00007ffff7b1618b in raise () from /lib/x86_64-linux-gnu/libc.so.6
  #1  0x00007ffff7af5859 in abort () from /lib/x86_64-linux-gnu/libc.so.6
  #2  0x00007ffff7af5729 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
  #3  0x00007ffff7b06f36 in __assert_fail () from /lib/x86_64-linux-gnu/libc.so.6
  #4  0x00005555555889bb in viewer_session_attach (vsession=0x7fffdc001400, session=session@entry=0x7fffe8001180) at viewer-session.c:80
  #5  0x000055555557bcff in viewer_attach_session (conn=0x7fffd0001140) at live.c:1275
  #6  process_control (conn=0x7fffd0001140, recv_hdr=0x7fffeeffcaf0) at live.c:2341
  #7  thread_worker (data=<optimized out>) at live.c:2515
  #8  0x00007ffff7ccd609 in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
  #9  0x00007ffff7bf2293 in clone () from /lib/x86_64-linux-gnu/libc.so.6

Cause
=====

This assert appears to be entirely wrong.

It checks that the "viewer session" has a NULL current trace chunk when
attaching a session to a viewer session, but in the case where a viewer
session has multiple sessions (e.g. with kernel and ust tracing
combined), we are attaching each session individually to the viewer
session, and we set the current trace chunk of the viewer session when
we attach the first session to it.

So it is expected to be non-NULL when attaching the second session.

Solution
========

Remove the assertion.

Known limitations
=================

None.

Fixes: #1335
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I4d8f5d5347b4588144ddf449976cae5a94b81b3a