mtdpstore_block_isbad
if (mtdpstore_block_isbad(cxt, off))
if (mtdpstore_block_isbad(cxt, off))
if (mtdpstore_block_isbad(cxt, off))
if (mtdpstore_block_isbad(cxt, off))
ret = mtdpstore_block_isbad(cxt, off);