pcapparse: fix another regression
Introduced by c4c9fe60 pcapparse: Take buffer directly from the adapter Using gst_adapter_take_buffer_fast() can lead to buffers that are made up of multiple memories with the first memory smaller than the RTP header size, which violates assumptions GstRtpBaseDepayloader makes, namely that the complete RTP header will be in the first memory. This leads to such packets being dropped when feeding them from pcapparse to RTP depayloaders. Use take_buffer() so we get buffers with a single memory.
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