Player stalls when mediaIndex is less than 0 at live mode within segment-loader.js

[suggestedfixes]

This occurs when the computed mediaIndex is negative in checkBuffer_ in segment-loader.js https://github.com/videojs/http-streaming/blob/main/src/segment-loader.js#L1189 As a result, the player stalls. This is likely due to server-side expiring items not currently on the playlist. Proposed fix:

if (mediaIndex !== null) {
  mediaIndex = Math.max(0, mediaIndex)
  ...
}

[stale[bot]]

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