test_efi_selftest_test_input_ex test failure

[Simon Glass]

Hi Heinrich,

I got a failure on this commit:

https://gitlab.denx.de/u-boot/custodians/u-boot-dm/-/jobs/102827

then a retry succeeded:

https://gitlab.denx.de/u-boot/custodians/u-boot-dm/-/jobs/102828

Any ideas on this?

Some time ago I had a problem with buildman where the 4k pipe buffer
for console output would happen within a unicode character. I'm not
sure if this has anything to do with the problem, or if pytest uses
'bytes' under the hood or not.

Regards,
Simon