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For fields outside the buffer length provided, reset any pointers, which were supposed to be updated by a ParseAcpi() function call to NULL. This way one can easily validate if a pointer was successfully updated. The ParseAcpi() function parses the given ACPI table buffer by a number of bytes which is a minimum of the buffer length and the length described by ACPI_PARSER array. If the buffer length is shorter than the array describing how to process the ACPI structure, then it is possible that the ItemPtr inside ACPI_PARSER may not get updated or initialized. This can lead to an error if the value pointed to by ItemPtr is later used to control the parsing logic. A typical example would be a 'number of elements' field in an ACPI structure header which defines how many substructures of a given type are present in the structure body. If the 'number of elements' field is not parsed, we will have a dangling pointer which could cause a problem later. Signed-off-by: Krzysztof Koch <krzysztof.koch@arm.com>