mac80211_hwsim: make netlink policy const

The netlink policy in hwsim should be const, there's no
reason for it not to be.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c
index 69d4c31..7d132b1 100644
--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -451,7 +451,7 @@
 
 /* MAC80211_HWSIM netlink policy */
 
-static struct nla_policy hwsim_genl_policy[HWSIM_ATTR_MAX + 1] = {
+static const struct nla_policy hwsim_genl_policy[HWSIM_ATTR_MAX + 1] = {
 	[HWSIM_ATTR_ADDR_RECEIVER] = { .type = NLA_UNSPEC, .len = ETH_ALEN },
 	[HWSIM_ATTR_ADDR_TRANSMITTER] = { .type = NLA_UNSPEC, .len = ETH_ALEN },
 	[HWSIM_ATTR_FRAME] = { .type = NLA_BINARY,