fix double free in SQLiteBackup.Close() on error #345
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The sqlite3_backup_finish() function never fails, it just returns the error code from previous operations. Previously if it returned an error, the finalizer wouldn't be unset and sqlite3_backup_finish() would be run again on an already-finished backup. This results in a double-free and often segfaults. The error handling is described in more detail in the "Error handling" section of https://www.sqlite.org/backup.html.
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The sqlite3_backup_finish() function never fails, it just returns the
error code from previous operations. Previously if it returned an
error, the finalizer wouldn't be unset and sqlite3_backup_finish() would
be run again on an already-finished backup. This results in a
double-free and often segfaults.
The error handling is described in more detail in the "Error handling"
section of https://www.sqlite.org/backup.html.