xtensa: ISS: Use kmalloc_array() in simdisk_init()

* A multiplication for the size determination of a memory allocation
indicated that an array data structure should be processed.
Thus use the corresponding function "kmalloc_array".

This issue was detected by using the Coccinelle software.

* Replace the specification of a data type by a pointer dereference
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: Max Filippov <[e-mail]>

arch/xtensa/platforms/iss/simdisk.c

···
 	if (simdisk_count > MAX_SIMDISK_COUNT)
 		simdisk_count = MAX_SIMDISK_COUNT;
 
-	sddev = kmalloc(simdisk_count * sizeof(struct simdisk),
-			GFP_KERNEL);
+	sddev = kmalloc_array(simdisk_count, sizeof(*sddev), GFP_KERNEL);
 	if (sddev == NULL)
 		goto out_unregister;