iwlwifi: use kmemdup in iwl_parse_nvm_mcc_info()

Use kmemdup rather than duplicating its implementation in
iwl_parse_nvm_mcc_info().

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/iwl-nvm-parse.c

@@ -1195,14 +1195,12 @@ iwl_parse_nvm_mcc_info(struct device *dev, const struct iwl_cfg *cfg,
 	regd_to_copy = sizeof(struct ieee80211_regdomain) +
 		valid_rules * sizeof(struct ieee80211_reg_rule);
 
-	copy_rd = kzalloc(regd_to_copy, GFP_KERNEL);
+	copy_rd = kmemdup(regd, regd_to_copy, GFP_KERNEL);
 	if (!copy_rd) {
 		copy_rd = ERR_PTR(-ENOMEM);
 		goto out;
 	}
 
-	memcpy(copy_rd, regd, regd_to_copy);
-
 out:
 	kfree(regdb_ptrs);
 	kfree(regd);