netfilter: bitwise: replace hard-coded size with `sizeof` expression

When calculating the length of an array, use the appropriate `sizeof`
expression for its type, rather than an integer literal.

Signed-off-by: Jeremy Sowden <[e-mail]>
Signed-off-by: Florian Westphal <[e-mail]>

net/netfilter/nft_bitwise.c

···
 {
 	unsigned int i;
 
-	for (i = 0; i < DIV_ROUND_UP(priv->len, 4); i++)
+	for (i = 0; i < DIV_ROUND_UP(priv->len, sizeof(u32)); i++)
 		dst[i] = (src[i] & priv->mask.data[i]) ^ priv->xor.data[i];
 }