hdf5

[svn-r20901] Remove if() that avoided a copy of the last element to itself. This was to solve an issue of a difference between 1.8 and trunk. 1.8 used the wrong variable in the if() and upon reflection the if() was determined to be unnecessary and complicated the logic. 1.8 tests would have treated the if() as always true with the result being the same as though the if() was absent.
This change reflects that equivalance and will avoid a potential problem in 1.8.

Tested: local linux, reviewed by two developers