BUG/MINOR: mux_quic: do not interrupt recv on error/incomplete data

BUG/MINOR: mux_quic: do not interrupt recv on error/incomplete data

Prior to this patch, qcc_io_recv() stream decoding loop was interrupted
on the first decoding error or if incomplete data could not be parsed.

This patch adjusts this part so that loop is stopped only on a
connection level error. In case of a stream level error or on incomplete
data, decoding continues on the next QCS entry.

Without this patch, there is a risk that a QCS decode is not performed
as expected, with a possible client timeout firing. This is pretty
unlikely though. However this patch is still necessary to remove
completely this possibility.

This should be backported up to 3.2.