This patch fixes the build error for CONFIG_CMD_MTDPARTS_SPREAD
Signed-off-by: Maxin B. John <maxin.john@enea.com>
        *truncated = 0;
        *len_incl_bad = 0;
 
-       if (!mtd->block_isbad) {
+       if (!mtd->_block_isbad) {
                *len_incl_bad = length;
                return;
        }
 
                block_len = mtd->erasesize - (offset & (mtd->erasesize - 1));
 
-               if (!mtd->block_isbad(mtd, offset & ~(mtd->erasesize - 1)))
+               if (!mtd->_block_isbad(mtd, offset & ~(mtd->erasesize - 1)))
                        len_excl_bad += block_len;
 
                *len_incl_bad += block_len;