Make sure that when calling vmem_alloc that we
do not have GFP_ZERO set. Once the memory is allocated
then zero out the memory if GFP_ZERO is passed to
vmem_alloc.
git-svn-id: https://outreach.scidac.gov/svn/spl/trunk@88 7e1ea52c-4ff2-0310-8f11-9dd32ca42a1c