VPAAMP-245: Negative Latency value logged while HLS linear playback

[psiva01]

w/o TSB

Reason for change: EndPos is set to -1 for TSB-less playback before latency calculation. This caused latency to be negative, since HLS latency is calculated as EndPos - CurrPos. So, moved this tsbless block after latency calculation. Also, fixed start and end values in aamp pos logging.

[Copilot]

Pull request overview

Fixes negative live-latency reporting during TSB-less linear HLS playback by ensuring end is not overwritten to -1 until after latency is computed, and improves progress logging to correctly print sentinel -1 start/end values.

Changes:

• Move the “TSB-less linear” start/end = -1 override to occur after live latency calculation.
• Adjust aamp pos logging to avoid printing 0 when start/end are -1 (sentinel), while keeping normal ms→s formatting for valid values.

Comments suppressed due to low confidence (1)

priv_aamp.cpp:2819

• New code introduces C-style casts when converting ms to seconds (e.g., (long)(val / 1000) and (long)(reportFormattedCurrPos / 1000)). Prefer static_cast<long>(...) for safer, more explicit C++ casting in this file.

					auto format_pos = [](double val) -> long {
						return (val == -1.0) ? -1 : (long)(val / 1000);
					};
					AAMPLOG_MIL("aamp pos: [%ld..%ld..%ld..%lld..%.2f..%.2f..%.2f..%s..%" BITSPERSECOND_FORMAT "..%" BITSPERSECOND_FORMAT "..%.2f]",
							format_pos(start),
							(long)(reportFormattedCurrPos / 1000),
							format_pos(end),