mtd: ssfdc: Improve a size determination in ssfdcr_add_mtd()

Replace the specification of a data structure by a pointer dereference
as the parameter for the operator "sizeof" to make the corresponding size
determination a bit safer according to the Linux coding style convention.

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

drivers/mtd/ssfdc.c

···
 	if (cis_sector == -1)
 		return;
 
-	ssfdc = kzalloc(sizeof(struct ssfdcr_record), GFP_KERNEL);
+	ssfdc = kzalloc(sizeof(*ssfdc), GFP_KERNEL);
 	if (!ssfdc)
 		return;