Flex array is used to allocate hash buckets which is type struct
hlist_head, but we use `struct hlist_head *` to calculate
array size.  Since hlist_head is of size pointer it works fine.
Following patch use correct type.
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>
        struct flex_array *buckets;
        int i, err;
 
-       buckets = flex_array_alloc(sizeof(struct hlist_head *),
+       buckets = flex_array_alloc(sizeof(struct hlist_head),
                                   n_buckets, GFP_KERNEL);
        if (!buckets)
                return NULL;