try to send after copying to write buffer.
try to send after copying to write buffer.

This should fix write starvation that happened on MX with many active isochronuous siganls connected to CX27. Peer on CX27 got disconnected when retrieving ds404 states.

gatzka/cjet,mloy/cjet,mloy/cjet,gatzka/cjet,gatzka/cjet,gatzka/cjet,mloy/cjet,mloy/cjet,mloy/cjet,gatzka/cjet