sdpdemux: don't send EOS for unknown SSRC
The rtpbin sends signals for all SSRCs. Don't send an EOS when the SSRC does not match the stream SSRC.
This avoids problems when an SSRC from another receiver times out.
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The rtpbin sends signals for all SSRCs. Don't send an EOS when the SSRC does not match the stream SSRC.
This avoids problems when an SSRC from another receiver times out.