[PATCH V3] tools/perf/tests: Fix string substitutions in build id test

[David Laight]

From: Athira Rajeev
> Sent: 19 January 2023 14:27
...
> The test script "tests/shell/buildid.sh" uses some of the
> string substitution ways which are supported in bash, but not in
> "sh" or other shells. Above error on line number 69 that reports
> "Bad substitution" is:

Looks better - assuming it works :-)

	David

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