Andrey V. Elsukov b57d97215e Add if_input_default() method, that will be used for if_input
initialization, when no input method specified before if_attach().

This prevents panics when if_input() method called directly e.g.
from bpf(4) code.

PR:		192426
Reviewed by:	glebius
MFC after:	1 week
2015-03-12 14:55:33 +00:00
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