[PATCH] nexthop_compare_node: fix NULL iface dereference

[Mathieu Hautebas]

Hello,

I am proposing a fix for a segfault encountered in bird6, in the
nexthop_compare_node function.

This patch adds checks for validating that x->iface and y->iface are not
null before accessing their index field.

I initially proposed a fix on calico's bird fork :
https://github.com/projectcalico/bird/pull/117 but I was asked to propose
it to the official repo.

Please find the full patch attached.
Best regards,

Mathieu.
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