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[RFA] buildsym.c, guard against null pointer.



Elena,

I came upon this whilst debugging C++ in COFF.  I don't know
why the null pointer came along, but this at least prevents
gdb from dumping core.

2002-05-21  Michael Snyder  <msnyder@redhat.com>

	* buildsym.c (finish_block): Guard against null pointer.

Index: buildsym.c
===================================================================
RCS file: /cvs/src/src/gdb/buildsym.c,v
retrieving revision 1.16
diff -p -r1.16 buildsym.c
*** buildsym.c	15 May 2002 21:19:18 -0000	1.16
--- buildsym.c	22 May 2002 01:42:55 -0000
*************** finish_block (struct symbol *symbol, str
*** 387,393 ****
       start of this scope that don't have superblocks yet.  */
  
    opblock = NULL;
!   for (pblock = pending_blocks; pblock != old_blocks; pblock = pblock->next)
      {
        if (BLOCK_SUPERBLOCK (pblock->block) == NULL)
  	{
--- 387,395 ----
       start of this scope that don't have superblocks yet.  */
  
    opblock = NULL;
!   for (pblock = pending_blocks; 
!        pblock && pblock != old_blocks; 
!        pblock = pblock->next)
      {
        if (BLOCK_SUPERBLOCK (pblock->block) == NULL)
  	{


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