file_iterator: return correct error when iterator is not a file #110
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This change fixes the error code that was returned when a file iterator was initialized with a directory. Before this change, the iterator treated all file types as regular files and failed when they returned bogus file addresses. That works, but it is fragile and not the correct behavior.
This change adds a check to the iterator to ensure that it is initialized with a file and returns
-SQSH_ERROR_NOT_A_FILE
when it is not.fixes #108.