qeth: fix possible memory leak in qeth_l3_add_[vipa|rxip]()

ipaddr has been allocated in function qeth_l3_add_vipa() but
does not free before leaving from the error handling cases. The
same problem also exists in function qeth_l3_add_rxip().

spatch with a semantic match is used to found this problem.
(http://coccinelle.lip6.fr/)

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/s390/net/qeth_l3_main.c

@@ -794,6 +794,7 @@ int qeth_l3_add_vipa(struct qeth_card *card, enum qeth_prot_versions proto,
 		rc = -EEXIST;
 	spin_unlock_irqrestore(&card->ip_lock, flags);
 	if (rc) {
+		kfree(ipaddr);
 		return rc;
 	}
 	if (!qeth_l3_add_ip(card, ipaddr))
@@ -858,6 +859,7 @@ int qeth_l3_add_rxip(struct qeth_card *card, enum qeth_prot_versions proto,
 		rc = -EEXIST;
 	spin_unlock_irqrestore(&card->ip_lock, flags);
 	if (rc) {
+		kfree(ipaddr);
 		return rc;
 	}
 	if (!qeth_l3_add_ip(card, ipaddr))