mtd: inftlcore: fix repeated words in comments

Delete the redundant word 'it'.

Signed-off-by: Jilin Yuan <[e-mail]>
Signed-off-by: Miquel Raynal <[e-mail]>
Link: https://lore.kernel.org/linux-mtd/[e-mail]

drivers/mtd/inftlcore.c

···
 	 * Newest unit in chain now contains data from _all_ older units.
 	 * So go through and erase each unit in chain, oldest first. (This
 	 * is important, by doing oldest first if we crash/reboot then it
-	 * it is relatively simple to clean up the mess).
+	 * is relatively simple to clean up the mess).
 	 */
 	pr_debug("INFTL: want to erase virtual chain %d\n", thisVUC);