cy bd58ae977c Identify the return value (rval) that led to the IPv4 NAT failure
in ipf_nat_checkout() and report it in the frb_natv4out and frb_natv4in
dtrace probes.

This is currently being used to diagnose NAT failures in PR/208566. It's
rather handy so this commit makes it available for future diagnosis and
debugging efforts.

PR:		208566
MFC after:	1 week
2018-08-10 00:04:32 +00:00
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