nl80211: clarify nl80211_set_reg() success path

Setting rd to NULL to avoid freeing it, just to be able to return
from the function in a single place, doesn't make much sense.

Return the set_regdom() return value directly.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/wireless/nl80211.c

@@ -5836,10 +5836,8 @@ static int nl80211_set_reg(struct sk_buff *skb, struct genl_info *info)
 		}
 	}
 
-	r = set_regdom(rd, REGD_SOURCE_CRDA);
-	/* set_regdom took ownership */
-	rd = NULL;
-
+	/* set_regdom takes ownership of rd */
+	return set_regdom(rd, REGD_SOURCE_CRDA);
  bad_reg:
 	kfree(rd);
 	return r;