mtd: sm_ftl: Fix typos in comments

Fix typo in the description of the 'succesfull'.
Signed-off-by: Bo Liu <liubo03@inspur.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20230621020331.1508-1-wangdeming@inspur.com

drivers/mtd/sm_ftl.c

@@ -981,7 +981,7 @@ static int sm_cache_flush(struct sm_ftl *ftl)
 	/* Update the FTL table */
 	zone->lba_to_phys_table[ftl->cache_block] = write_sector;
 
-	/* Write succesfull, so erase and free the old block */
+	/* Write successful, so erase and free the old block */
 	if (block_num > 0)
 		sm_erase_block(ftl, zone_num, block_num, 1);