[tz] Bug in 2022f version of zic.c

[Tim McBrayer]

Hi,

tzcode2022f/zic.c has a bug in its memory checker routine in static void* 
memcheck(void*). This code throws an error and exits when the pointer 
returned by malloc is NULL. However, malloc is allowed to return a NULL 
pointer when the allocation size is 0. And, on one machine I am building 
the TZ code on, malloc(0) does indeed return NULL. This is an AIX 6.1 box, 
with C compiler xlC 13.01.0000.0011.

This is easy enough to work around locally. However, it would be nice to 
get this fixed for any future release of the TZ code.

--- 
Tim McBrayer
Ab Initio Software

  
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