Loosen test for initial stream alignment before prefetch. We could ot…

…herwise end up with a stream with no segment left. So we ensure there's always at least one.

This is required for HLS streams where the backup streams don't match at all (e.g. France24 stream)

mythtv/libs/libmythtv/HLS/httplivestreambuffer.cpp

@@ -2367,7 +2367,7 @@ void HLSRingBuffer::SanitizeStreams(StreamsList *streams)
             // perfect, leave it alone
             continue;
         }
-        if (todrop > hls->NumSegments() || todrop < 0)
+        if (todrop >= hls->NumSegments() || todrop < 0)
         {
             LOG(VB_PLAYBACK, LOG_ERR, LOC +
                 QString("stream %1 [id=%2] can't be properly adjusted, ignoring")