cfg80211: fix possible memory leak in regdb_query_country()

'wmm_ptrs' is malloced in regdb_query_country() and should be freed
before leaving from the error handling cases, otherwise it will cause
memory leak.

Fixes: 230ebaa189af ("cfg80211: read wmm rules from regulatory database")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
[johannes: add Fixes tag]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/wireless/reg.c

@@ -1026,6 +1026,7 @@ static int regdb_query_country(const struct fwdb_header *db,
 
 			if (!tmp_rd) {
 				kfree(regdom);
+				kfree(wmm_ptrs);
 				return -ENOMEM;
 			}
 			regdom = tmp_rd;