mtd: nand: ams-delta: fix overwritten mtd_info->owner in initialization

In initialization routine, mtd_info->owner is overwritten by memset()
just after being initialized. This can be fixed by moving memset() calls
to just before setting mtd_info->owner. But the memory region is allocated
by kmalloc, so we can fix it by using kzalloc instead of kmalloc.

Signed-off-by: Akinobu Mita <[e-mail]>
Cc: Jonathan McDowell <[e-mail]>
Cc: David Woodhouse <[e-mail]>
Signed-off-by: Brian Norris <[e-mail]>

drivers/mtd/nand/ams-delta.c

···
 		return -ENXIO;
 
 	/* Allocate memory for MTD device structure and private data */
-	ams_delta_mtd = kmalloc(sizeof(struct mtd_info) +
+	ams_delta_mtd = kzalloc(sizeof(struct mtd_info) +
 				sizeof(struct nand_chip), GFP_KERNEL);
 	if (!ams_delta_mtd) {
 		printk (KERN_WARNING "Unable to allocate E3 NAND MTD device structure.\n");
···
 
 	/* Get pointer to private data */
 	this = (struct nand_chip *) (&ams_delta_mtd[1]);
-
-	/* Initialize structures */
-	memset(ams_delta_mtd, 0, sizeof(struct mtd_info));
-	memset(this, 0, sizeof(struct nand_chip));
 
 	/* Link the private data with the MTD structure */
 	ams_delta_mtd->priv = this;