Zero out the region size when freeing the region so callers don't think
there's anything there.   (Pointer is already set to NULL from the realloc
result itself.)  Return 0 to the callers, and have them cascade that back
to their callers to indicate failure, instead of their usual return value
of 1 on success.
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Backported-to-NX-by: Ulrich Sibiller <uli42@gmx.de>