clwords bugfix

[Zefram <A.Main@dcs.warwick.ac.uk>]

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There is a bug in zle_tricky.c (ooh, what a surprise).  When the
clwords array needs to be resized, the new part of the array is
supposed to be initialised to NULLs.  The current version has
an off-by-one error, meaning that it clears the current element
(which is immediately freed, so there is only a memory leak here),
but it doesn't clear the new last element (this causes crashes).
The patch below fixes this, and changes it to use a looped assignment
rather than memset, as NULL is not all-bits-zero on all machines.

 -zefram

      Index: Src/zle_tricky.c
      *** zle_tricky.c	1996/05/25 13:14:10	1.22
      --- zle_tricky.c	1996/05/25 13:33:10
      ***************
      *** 998,1006 ****
        	 * more complicated compctl -x things).  They are stored in the     *
        	 * clwords array.  Make this array big enough.                      */
        	if (i + 1 == clwsize) {
        	    clwords = (char **)realloc(clwords,
        				       (clwsize *= 2) * sizeof(char *));
      ! 	    memset((void *) (clwords + i), 0, (clwsize / 2) * sizeof(char *));
        	}
        	zsfree(clwords[i]);
        	/* And store the current token string. */
      --- 998,1008 ----
        	 * more complicated compctl -x things).  They are stored in the     *
        	 * clwords array.  Make this array big enough.                      */
        	if (i + 1 == clwsize) {
      + 	    int n;
        	    clwords = (char **)realloc(clwords,
        				       (clwsize *= 2) * sizeof(char *));
      ! 	    for(n = clwsize; --n > i; )
      ! 		clwords[n] = NULL;
        	}
        	zsfree(clwords[i]);
        	/* And store the current token string. */

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