[perl #43851] All calls to stack_entry need to be NULL-checked

[Bob Rogers]

   From: Andy Lester (via RT) <[EMAIL PROTECTED]>
   Date: Fri, 13 Jul 2007 08:31:36 -0700

   # New Ticket Created by  Andy Lester 
   # Please include the string:  [perl #43851]
   # in the subject line of all future correspondence about this issue. 
   # <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=43851 >

   Splint helpfully points out that we're using the results of  
   stack_entry() throughout stacks.c without checking the NULLness of  
   the return value.  We need to check each before dereferencing.

Are there any?  The only ones I can find that that Splint might be
complaining about are the derefs in rotate_entries, but the code
explicitly checks that stack_height is large enough such that
stack_entry will never return NULL.  True?

                                        -- Bob Rogers
                                           http://rgrjr.dyndns.org/