hdf5_ep

Merge pull request #939 in HDFFV/hdf5 from ~LRKNOX/hdf5_lrk:HDFFV-10397-testphdf5-has-some-memory-leaks to develop

* commit '5d7c18fcfc14a53f4d6321460463357fbda61f4b':
  Remove comparison to NULL for variables to be freed.
  Add HDfree of vector, matrix_out and matrix_out1 previously HDmalloced in coll_write_test().