This avoids checking that the playlist exists over and over again. The
playlist always exists when an interface is running.

Also remove a useless and unsynchronized test.

This restores symmetry in the playlist API, but most importantly, it
is necessary to fix some corner case races (in later commits).

This is based on code which was silently removed in
0f9a94f2 and
45c2bc08.

The patch solves timing issues if the user changes the system time, for
instance while playback.

Another timing issue was pointed out if vlc_cond_init_with_daytime is used.
This remains unfixed, and is documented in a Fixme.

close #10072

This should not happen in the current implementation.

Commit 7655d6c8 changes HLS http
playlist reloading policy. But leaving only one fragment in buffer is
not enough. This patch ensures that less than three fragments in buffer
leads to playlist reloading. The overal result is more reliable http
streams.
Signed-off-by: Ilkka Ollakka <ileoo@videolan.org>

Negative being meaningless.

Negative being meaningless.

This is now managed by the playlist and video output core.