NULL need not be all bits 0

[D. Hugh Redelmeier]

| From: Werner Koch <wk@gnupg.org>

| > gnupg-1.0.0/mpi/mpi-mpow.c" line 90:
| >     G = m_alloc_clear( (1<<k) * sizeof *G );
| 
| But sure, you are right here - in this case the compiler can't know
| that we are going to store 0s in some pointers.

That is the case I was talking about.  I have used such a machine (but
they are rare).

I've found the problem in three spots in primegen.c too.  I've
replaced it with calls to the following macro.  The advantage of a
macro is that it can be generic.

#define m_alloc_ptrs_clear(pp, n) { \
	int c = (n); \
	(pp) = alloc_bytes((n) * sizeof(*(pp)), "m_alloc_ptrs_clear"); \
	while (c > 0) (pp)[--c] = NULL; \
    }

Hugh Redelmeier
hugh@mimosa.com  voice: +1 416 482-8253