[U-Boot] [U-Boot, v16, 1/4] efi: Check for failure to create objects in selftest

[Alexander Graf]

> At present a few error conditions are not checked. Before refactoring
> this code, add some basic checks. Note that this code still leaks memory
> in the event of error. This will be tackled after the refactor.
> 
> Signed-off-by: Simon Glass <sjg at chromium.org>

Thanks, applied to efi-next

Alex