ipack: Improve a size determination in ipack_bus_register()

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]>
Acked-by: Samuel Iglesias Gonsálvez <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/ipack/ipack.c

···
 	int bus_nr;
 	struct ipack_bus_device *bus;
 
-	bus = kzalloc(sizeof(struct ipack_bus_device), GFP_KERNEL);
+	bus = kzalloc(sizeof(*bus), GFP_KERNEL);
 	if (!bus)
 		return NULL;