blkdebug: Refactor error injection
Rather than repeat the logic at each caller of checking if a Rule exists that warrants an error injection, fold that logic into inject_error(); and rename it to rule_check() for legibility. This will help the next patch, which adds two more callers that need to check rules for the potential of injecting errors. Signed-off-by:Eric Blake <eblake@redhat.com> Reviewed-by:
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