tree.c (restore_tree_status): Do not dereference a null pointer.

        * tree.c (restore_tree_status): Do not dereference a null pointer.
Brought over from devo.  SHould fix 921215-1.c compilation failures.

From-SVN: r17225

gcc/ChangeLog

+Wed Dec 24 22:34:55 1997  Jeffrey A Law  (law@cygnus.com)
+
+	* tree.c (restore_tree_status): Do not dereference a null pointer.
+
 Tue Dec 23 12:56:46 1997 Paul Eggert <eggert@twinsun.com>:
 
 	* genattrtab.c (main): Check HAVE_{G,S}ETRLIMIT in addition to

gcc/tree.c

@@ -445,13 +445,16 @@ restore_tree_status (p, context)
     {
       struct simple_obstack_stack *current, **p = &toplev_inline_obstacks;
 
-      while ((*p)->obstack != function_maybepermanent_obstack)
-	p = &((*p)->next);
-      current = *p;
-      *p = current->next;
+      if ((*p) != NULL)
+	{
+	  while ((*p)->obstack != function_maybepermanent_obstack)
+	    p = &((*p)->next);
+	  current = *p;
+	  *p = current->next;
 
-      current->next = extra_inline_obstacks;
-      extra_inline_obstacks = current;
+	  current->next = extra_inline_obstacks;
+	  extra_inline_obstacks = current;
+	}
     }
 
   obstack_free (function_obstack, 0);