checkkconfigsymbols.py: support git's "^" syntax
Support git's "^" syntax for diffing two commits, for instance via "--diff HEAD^^^..HEAD". Signed-off-by: NMichael Ellermann <mpe@ellerman.id.au> Signed-off-by: NValentin Rothberg <valentinrothberg@gmail.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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