Remove several ASSERT in XhciDxe to allow error status happen then do error handling.

Signed-off-by: Elvin Li <elvin.li@intel.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>


git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14574 6f19259b-4bc3-4df7-8a09-765794883524
MdeModulePkg/DiskIoDxe: Fixed GCC build error

Error: Variable "Media" was set but never used.

Change-Id: I1297b3de797e436ed403375c801945b3202b532c
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Olivier Martin <olivier.martin@arm.com>
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14575 6f19259b-4bc3-4df7-8a09-765794883524