Added a check that ensures page_size is not set to zero in
H5Pset_core_write_tracking(). This ensures that the behavior
matches the description in the reference manual.

Tested on a local linux VM. This is a very minor change.


git-svn-id: https://svn.hdfgroup.uiuc.edu/hdf5/trunk@25508 dab4d1a6-ed17-0410-a064-d1ae371a2980