hdf5_ep

[svn-r5881] Purpose:
    bug fix
Description:
    Last change of FUNC_ENTER to FUNC_ENTER_NOAPI did not include
    definition of variable ret_value and label done.
Solution:
    Added the missing ret_value and label done.
    Not sure if the logic is correct since the function will abort
    if some assert fails.  This fix only takes care of the syntax
    error.
Platforms tested:
    eirene(pp).  Did not test on other machine since the syntax fix
    is pretty simple.