[SRU X/B/F/G/U] LP: #1908710

[Thadeu Lima de Souza Cascardo]

When sending the fix for CVE-2020-27777, the following regression was
introduced. It should only affect IBM POWER LPARs, though, and a feature that
allows testing for failures, named error injection. So, marked as Low.

[Impact]
errinjct open fails on IBM POWER LPAR. That prevents error injection
tests to be performed.

[Test case]
Run errinjct open on an LPAR.
Success case:
$ sudo errinjct open
RTAS error injection facility open, token = 1
Failure case:
$ sudo errinjct open
errinjct: Could not open RTAS error injection facility

errinjct: librtas: open: Unexpected I/O error

[Fix]
Typo in RTAS filters.

[Regression potential]
errinjct could still be broken, or other RTAS operations could break,
which could even prevent booting on any IBM POWER systems.