UBI: Fix invalidate_fastmap()

Onging tests uncovered that invalidate_fastmap() is broken.
It must not call ubi_wl_put_fm_peb() because all PEBs used
by the old fastmap have already been put back.

Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

drivers/mtd/ubi/fastmap.c

@@ -1343,7 +1343,7 @@ out:
 static int invalidate_fastmap(struct ubi_device *ubi,
 			      struct ubi_fastmap_layout *fm)
 {
-	int ret, i;
+	int ret;
 	struct ubi_vid_hdr *vh;
 
 	ret = erase_block(ubi, fm->e[0]->pnum);
@@ -1360,9 +1360,6 @@ static int invalidate_fastmap(struct ubi_device *ubi,
 	vh->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
 	ret = ubi_io_write_vid_hdr(ubi, fm->e[0]->pnum, vh);
 
-	for (i = 0; i < fm->used_blocks; i++)
-		ubi_wl_put_fm_peb(ubi, fm->e[i], i, fm->to_be_tortured[i]);
-
 	return ret;
 }