mtd: mtdswap: fix integer overflow

Caught by Coverity.

Signed-off-by: Brian Norris <[e-mail]>

drivers/mtd/mtdswap.c

···
 	}
 
 	eblocks = mtd_div_by_eb(use_size, mtd);
-	use_size = eblocks * mtd->erasesize;
+	use_size = (uint64_t)eblocks * mtd->erasesize;
 	bad_blocks = mtdswap_badblocks(mtd, use_size);
 	eavailable = eblocks - bad_blocks;