hls: do not access pb->opaque for custom IO.

As the name indicates we can't just assume what the
"opaque" field contains.
This fixes a crash in third-party applications see e.g.:
http://bugzilla.mplayerhq.hu/show_bug.cgi?id=2126



This fixes also FFmpeg trac #2293, which is a different
third-party application.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>