netstat -f gets SEGV if no `family' specified

[Felix Lee]

Serial Number: 922E0914    Machine Type: Sun 4/280S    O/S Version: SunOS 4.0.3
Organization:   Computer Science Department, The Pennsylvania State University
                333 Whitmore Laboratory, University Park, PA   16802
Phone Number:   +1 814 865 9723

Description:
	the netstat command gets a `segmentation fault' if the `-f' switch is
	specified but a family is not given as an argument.

Repeat-By:
	psuvax1:124> netstat -f
	Segmentation fault

Fix:
	This bug was reported by this site in SunOS 4.0 and a fix was sent
	to Sun many moons ago.  Looks like <hotline at sun.com> is still a black
	hole in spite of what Sun has said.