ShellPkg: Add comment that ItemPtr is set after validation

Add a comment to clarify that in Acpiview the ItemPtr is not set until
after the FieldValidator has been called.

Signed-off-by: Chris Jones <christopher.jones@arm.com>
Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>
Reviewed-by: Zhichao Gao <zhichao.gao@intel.com>
1 file changed