CouchKVStore::rollback doesn't give error messages from couchstore in event of failure

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    errCode = couchstore_changes_count(db, 0, latestSeqno, &totSeqCount);

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    if (errCode != COUCHSTORE_SUCCESS) {

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        logger.log(EXTENSION_LOG_WARNING, "Failed to get changes count for "

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                   "rollback vBucket = %d, rev = %" PRIu64, vbid, fileRev);

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        errCode = couchstore_rewind_db_header(newdb);

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        if (errCode != COUCHSTORE_SUCCESS) {

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            logger.log(EXTENSION_LOG_WARNING,

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                       "Failed to rewind Db pointer "

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                       "for couch file with vbid: %u, whose "

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                       "lastSeqno: %" PRIu64 ", while trying to roll back "

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                       "to seqNo: %" PRIu64,

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                       vbid, latestSeqno, rollbackSeqno);

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    errCode = couchstore_changes_count(db, info.last_sequence, latestSeqno,

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                                       &rollbackSeqCount);

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    if (errCode != COUCHSTORE_SUCCESS) {

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        logger.log(EXTENSION_LOG_WARNING, "Failed to get changes count for "

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                   "rollback vBucket = %d, rev = %" PRIu64, vbid, fileRev);