stream_filter/httplive.c: b_cache determined in wrong place

The logic to determine if caching of segments is allowed or denied was flawed. It
only determined it onces after the playlists were loaded. In case of a meta playlist
the logic would only indicated the caching value for the last added HLS stream.

The fix is to determine p_sys->b_caching (caching segments allowed or not) when switching
segments or HLS streams (adaptive bandwidth).

modules/stream_filter/httplive.c

@@ -815,10 +815,6 @@ static int parse_HTTPLiveStreaming(stream_t *s)
             /* Stream size (approximate) */
             hls->size = hls_GetStreamSize(hls);
         }
-
-        /* Can we cache files after playback */
-        p_sys->b_cache = hls->b_cache;
-
         vlc_mutex_unlock(&hls->lock);
     }
 
@@ -1394,6 +1390,7 @@ static segment_t *GetSegment(stream_t *s)
             /* This segment is ready? */
             if (segment->data != NULL)
             {
+                p_sys->b_cache = hls->b_cache;
                 vlc_mutex_unlock(&hls->lock);
                 return segment;
             }
@@ -1428,6 +1425,7 @@ static segment_t *GetSegment(stream_t *s)
             (p_sys->playback.segment < i_segment))
         {
             p_sys->playback.current = i_stream;
+            p_sys->b_cache = hls->b_cache;
             vlc_mutex_unlock(&hls->lock);
             return segment;
         }