MdeModulePkg/Partition: Fix media probe

MdeModulePkg/Partition: Fix media probe

The call in ProbeMediaStatusEx() to the ReadDisk() function of the
EFI_DISK_IO_PROTOCOL interface implemented in DiskIoDxe/DiskIo.c
crashed in DiskIo2ReadWriteDisk() because of the NULL value of
the destination buffer pointer.

Pass the address of a buffer in the stack instead of a NULL
pointer.

The similar fix was applied to ProbeMediaStatus in commit
df473cc1fc9acd1a623ec7e05276f2f0635c19d2
* MdeModulePkg/PartitionDxe: Fix media probe

Somehow ProbeMediaStatusEx() wasn't changed together.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
Tested-by: Jian J Wang <jian.j.wang@intel.com>