UBI: Fastmap: Calc fastmap size correctly

We need to add fm_sb too.
Signed-off-by: NRichard Weinberger <richard@nod.at>
Reviewed-by: NTanya Brokhman <tlinder@codeaurora.org>
Signed-off-by: NArtem Bityutskiy <artem.bityutskiy@linux.intel.com>

drivers/mtd/ubi/fastmap.c

@@ -24,7 +24,8 @@ size_t ubi_calc_fm_size(struct ubi_device *ubi)
 {
 	size_t size;
 
-	size = sizeof(struct ubi_fm_hdr) + \
+	size = sizeof(struct ubi_fm_sb) + \
+		sizeof(struct ubi_fm_hdr) + \
 		sizeof(struct ubi_fm_scan_pool) + \
 		sizeof(struct ubi_fm_scan_pool) + \
 		(ubi->peb_count * sizeof(struct ubi_fm_ec)) + \