nl80211: correctly use nl80211_nan_srf_policy

This was clearly intended to be used in the attribute parsing,
so do that instead of leaving the attribute policy unused.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 903cd5a..65c0a17 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -10786,7 +10786,8 @@
 
 		err = nla_parse(srf_tb, NL80211_NAN_SRF_ATTR_MAX,
 				nla_data(tb[NL80211_NAN_FUNC_SRF]),
-				nla_len(tb[NL80211_NAN_FUNC_SRF]), NULL);
+				nla_len(tb[NL80211_NAN_FUNC_SRF]),
+				nl80211_nan_srf_policy);
 		if (err)
 			goto out;