In revision 1.14 I broke the -4 and -6 options of sockstat(1).

In revision 1.14 I broke the -4 and -6 options of sockstat(1).
Using either one of the two would result in an empty protos[]
array, and no sockets were actually listed:

  % sockstat -4
  USER     COMMAND    PID   FD PROTO  LOCAL ADDRESS         FOREIGN ADDRESS
  % sockstat -6
  USER     COMMAND    PID   FD PROTO  LOCAL ADDRESS         FOREIGN ADDRESS
  %

Fix this bug by tweaking appropriately the logic of handling opt_4,
opt_6, opt_u and protos_defined.

Submitted by:	des
Pointy hat:	keramida