Instead of failing when neither PAM_TTY nor PAM_RHOST are available, call
login_access() with "**unknown**" as the second argument.  This will allow
"ALL" rules to match.

Reported by:	Tim Daneliuk <tundra@tundraware.com>
Tested by:	dim@
PR:		83099 193927
MFC after:	3 days


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272280 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f