MdeModulePkg/RuntimeDxe: clear mVirtualMapMaxIndex
When setting mVirtualMap to NULL also set mVirtualMapMaxIndex to 0.
Without that RuntimeDriverConvertPointer() will go search the ZeroPage
for EFI_MEMORY_DESCRIPTOR entries.
In case mVirtualMapMaxIndex happens to be small small enough that'll go
unnoticed, the search will not find anything and EFI_NOT_FOUND will be
returned.
In case mVirtualMapMaxIndex is big enough the search will reach the end
of the ZeroPage and trigger a page fault.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>