Use RETRIEVE instead of CHANGING for refresh question.

Signed-off-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>


git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14727 6f19259b-4bc3-4df7-8a09-765794883524
Fix the BdsExpandPartitionPartialDevicePathToFull() hang issue by duplicates BlockIoDevicePath when the CachedDevicePath returned from BdsLibDelPartMatchInstance() is NULL.

Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Chao B Zhang <chao.b.zhang@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14733 6f19259b-4bc3-4df7-8a09-765794883524
Merge branch 'master' of https://github.com/tianocore/edk2