Merge tag 'pull-request-2022-08-16' of https://gitlab.com/thuth/qemu into staging

* Fix a possible endless loop in USB XHCI code
* Minor fixes for the new readconfig test

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# gpg: Signature made Tue 16 Aug 2022 04:54:07 AM CDT
# gpg:                using RSA key 27B88847EEE0250118F3EAB92ED9D774FE702DB5
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# gpg: Good signature from "Thomas Huth <th.huth@gmx.de>" [undefined]
# gpg:                 aka "Thomas Huth <thuth@redhat.com>" [undefined]
# gpg:                 aka "Thomas Huth <th.huth@posteo.de>" [unknown]
# gpg:                 aka "Thomas Huth <huth@tuxfamily.org>" [undefined]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 27B8 8847 EEE0 2501 18F3  EAB9 2ED9 D774 FE70 2DB5

* tag 'pull-request-2022-08-16' of https://gitlab.com/thuth/qemu:
  hw/usb/hcd-xhci: Fix unbounded loop in xhci_ring_chain_length() (CVE-2020-14394)
  tests/qtest: misc tweaks to readconfig

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>