UEFI getnextvariablename get EFI_INVALID_PARAMETER instead of EFI_BUFFER_TOO_SMALL

[Ivan Hu]

Some firmwares (mostly on AMI Bios), the implementation limitation was seen that the VariableNameSize of the GetNextVariableName should lager or equal to 2. They believe that it should at least have a Null-terminated(2 bytes) for the name buffer.

So test getnextvariablename with VariableNameSize 0 and 1 will get the EFI_INVALID_PARAMETER, not expected EFI_BUFFER_TOO_SMALL.

For the fwts getnextvariablename buffer too small test(getnextvariable_test4),
1. add the VariableNameSize 2 for the test, if VariableNameSize 2 without returning EFI_BUFFER_TOO_SMALL, then test fail.
2. if VariableNameSize is 0 or 1, allow the extra return EFI_INVALID_PARAMETER.

[Ivan Hu (ivan.hu)]

Patch had release on fwts V16.06.00