Take out test for messages too big.
Take out test for messages too big.

Because allocation of p->write_buffer is done dynamically, this case
never happen.

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