cdiff bug fix

[Chad R. Larson]

I suspect y'all have caught and fixed this already, but in case you
haven't:  The version of the public domain context diff program I have
had a bug where it called perror(3) with a null pointer instead of a
pointer to a null string.  This caused my SysV.2 Unix to crash with the
infamous "Memory fault - core dumped" message.  The applicable version
of the program was posted to comp.sources.misc as Volume 2, Issue 63 and
submitted by Mark H. Colburn.  If your version is a different one this
may not apply.  Below is a context diff (suprise!) of the bug fix.  Use
Larry Wall's patch program, or install it by hand.  No Charge!
	-crl
-----------------------(start diff)--------------------------------
*** -
--- cdiff.c
**************
*** 1417,1423
  {
      fprintf(stderr, "Can't open %s file \"%s\": ", what, filename);
  #ifndef	OSK
!     perror((char *) NULL);
  #else
      prerr(0, errno);
  #endif
--- 1417,1423 -----
  {
      fprintf(stderr, "Can't open %s file \"%s\": ", what, filename);
  #ifndef	OSK
!     perror("");
  #else
      prerr(0, errno);
  #endif
-----------------------(end diff)--------------------------------
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