syntax-check: Simplify and fix unmarked_diagnostics
The check was concerning itself with whitespace where it didn't need to, and used some confusing escaping for one of its regular expressions - which GNU sed was fine with, but FreeBSD's sed didn't like one bit. Switch to extended regular expressions (which, incidentally, were already in use in the same rule when calling grep) and remove all whitespace handling. Signed-off-by: NAndrea Bolognani <abologna@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NJán Tomko <jtomko@redhat.com>
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