[PATCH]: Minor fix in blockframe.c

[Michael Snyder <msnyder at cygnus dot com>]

When setting up a new frame_info object, just use memset to pre-zero
it, rather than zeroing selected fields individually.  That way new ones
won't get overlooked.

2000-12-11  Michael Snyder  <msnyder@mvstp600e.cygnus.com>

        * blockframe.c (get_prev_frame): Zero all fields of prev by
        default using memset (instead of one at a time).

*** blockframe.c        2000/09/01 23:39:11     1.7
--- blockframe.c        2000/12/11 21:08:51
*************** get_prev_frame (struct frame_info *next_
*** 393,405 ****
      obstack_alloc (&frame_cache_obstack,
                   sizeof (struct frame_info));
  
!   prev->saved_regs = NULL;
    if (next_frame)
      next_frame->prev = prev;
    prev->next = next_frame;
-   prev->prev = (struct frame_info *) 0;
    prev->frame = address;
-   prev->signal_handler_caller = 0;
  
  /* This change should not be needed, FIXME!  We should
     determine whether any targets *need* INIT_FRAME_PC to happen
--- 393,405 ----
      obstack_alloc (&frame_cache_obstack,
                   sizeof (struct frame_info));
  
!   /* Zero all fields by default.  */
!   memset (prev, 0, sizeof (struct frame_info);
! 
    if (next_frame)
      next_frame->prev = prev;
    prev->next = next_frame;
    prev->frame = address;
  
  /* This change should not be needed, FIXME!  We should
     determine whether any targets *need* INIT_FRAME_PC to happen