Patch #2 to Pcomm v1.1

[Richard A. O'Keefe]

In article <13900004 at osiris.cso.uiuc.edu> hood at osiris.cso.uiuc.edu writes:
>This patch will fix the problem that some people are having with 
>seqmentation faults (although I'm not convinced the problem isn't
>in their compiler).

It isn't.  It's the famous *NULL bug.

>! 	if (*lock_path != NULL && lock_path != NULL) {

This only tests whether lock_path is legal *after* trying to use it!