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netif_add: check that the new netif is not already added
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@ -379,6 +379,7 @@ netif_add(struct netif *netif,
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}
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num_netifs = 0;
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for (netif2 = netif_list; netif2 != NULL; netif2 = netif2->next) {
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LWIP_ASSERT("netif already added", netif2 != netif);
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num_netifs++;
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LWIP_ASSERT("too many netifs, max. supported number is 255", num_netifs <= 255);
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if (netif2->num == netif->num) {
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