nl80211: Use signed function for a signed variable

The rssi_threshold is defined as s32.

Signed-off-by: Masashi Honma <masashi.honma@gmail.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index b15903b..bd5959f 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -5714,7 +5714,7 @@
 		       cur_params.dot11MeshGateAnnouncementProtocol) ||
 	    nla_put_u8(msg, NL80211_MESHCONF_FORWARDING,
 		       cur_params.dot11MeshForwarding) ||
-	    nla_put_u32(msg, NL80211_MESHCONF_RSSI_THRESHOLD,
+	    nla_put_s32(msg, NL80211_MESHCONF_RSSI_THRESHOLD,
 			cur_params.rssi_threshold) ||
 	    nla_put_u32(msg, NL80211_MESHCONF_HT_OPMODE,
 			cur_params.ht_opmode) ||