Guard against null rtpmap value in MP4RtpHintTrack::GetPayload#96
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Signed-off-by: Sai Asish Y <say.apm35@gmail.com>
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GetPayloadreads the rtpmap string withm_pRtpMapProperty->GetValue()and passes it straight tostrchr. On a file where that property is present but its value string is null, this dereferences a null pointer and crashes. Extend the existing guard so the block only runs when the value is non-null, which matches the null handling already used for the other output parameters. Fixes #89.