vchoi_fork

[svn-r3120] Purpose:
    Bug fix
Description:
    In H5FD_mpio_open, there was a mem-xfree of the file variable
    before it ever gets alloc'ed.  This is inside a failure condition
    that rarely happened.  But if it happens, it would be freeing
    a null pointer.
Solution:
    Removed the error code.
Platforms tested:
    Modi4 -64 parallel. (Everything still works. :-)