MINOR: mux-quic: remove unused bogus qcc_get_stream()

qcc_get_stream() was used when qcs and qc_stream_desc shared the same
node-tree. This is not the case anymore since
  e4301da5ed9e77844c653ea4caf233546febe591
  MINOR: quic-stream: use distinct tree nodes for quic stream and qcs

Now this function is broken as the qcc tree only contains qcs.
Thankfully it is unused so it can be removed without impact.
1 file changed