Fix a bug in Fat driver that it asserts when OpenEx/ReadEx/WriteEx is about to return failure.

Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14917 6f19259b-4bc3-4df7-8a09-765794883524
5 files changed