Request for review: 6916890

[Christopher Hegarty -Sun Microsystems Ireland]

In the case where a heap buffer is supplied the implementation copies 
the data into a temporary native buffer before going native. The 
position and remaining data is incorrectly determined for this temporary 
buffer when the position of the original buffer is not 0.

Also, remove incorrect assertion from implementation.
CR 6916890: SctpChannel.send may cause IAE if given a heap buffer with 
an offset

Webrev:
  http://cr.openjdk.java.net/~chegar/6916890/webrev.0/webrev/

Thanks,
-Chris.