libnvdimm, pmem: Complete REQ_FLUSH => REQ_PREFLUSH

Complete the move from REQ_FLUSH to REQ_PREFLUSH that apparently started
way back in v4.8.

Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Ross Zwisler 2018-06-06 10:45:12 -06:00 • committed by Dan Williams
commit d2d6364dcb