Joel Cunningham 36fa1a97d4 lwip_netconn_do_writemore() cleanups
This commit makes a couple of cleanups discussed in patch #8882:
  1) msg.w.offset should not be set to 0 in the error case.  It is
     only valid when err == ERR_OK
  2) Remove out-of-date comment which indicated the entire write had
     completed (not true for non-blocking write)

This also updates the documentation on offset to include that offset
is only valid when err == ERR_OK
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..
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