[NETFILTER]: arp_tables: fix NULL pointer dereference

The check is wrong and lets NULL-ptrs slip through since !IS_ERR(NULL)
is true.

Coverity #190

Signed-off-by: Patrick McHardy <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/ipv4/netfilter/arp_tables.c

···
 	struct arpt_table *t;
 
 	t = xt_find_table_lock(NF_ARP, entries->name);
-	if (t || !IS_ERR(t)) {
+	if (t && !IS_ERR(t)) {
 		struct xt_table_info *private = t->private;
 		duprintf("t->private->number = %u\n",
 			 private->number);