[Bug 289812] [vt] Make frsig field optional in VT_SETMODE.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289812

--- Comment #4 from Ed Maste <emaste@freebsd.org> ---
Interestingly, in lib/libvgl/main.c:  smode.frsig  = SIGINT;      

In any case I concur that frsig is currently unused and is unlikely to ever be
used, so requiring userland to set it doesn't make much sense.

I don't like having possibly-uninitialized values passed in though; what about
frsig == 0 as a special case, e.g.:

                        if (!(ISSIGVALID(mode->relsig) &&
                            ISSIGVALID(mode->acqsig) &&
                            (mode->frsig == 0 || ISSIGVALID(mode->frsig)))) {
                                DPRINTF(5, "error EINVAL\n");
                                return (EINVAL);
                        }

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