transfer: remove comments, add asserts #14688
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Curl_xfer_send and Curl_xfer_recv had commented FIXMEs about protocol setting up the transfers badly, but in reality these functions are too low-level to be able to depend on the protocol transfer setups having been done yet. Removed.
The functions had checks for data and data->conn that I convered to asserts since they SHOULD always be valid in this function. The same goes for the runtime check for buffer_size > 0 that I also converted to an assert since that should never be set to an invalid value.